Composer update not run

I have a problem when I run composer update for any project in laravel. It give me this error: Your requirements could not be resolved to an installable set of packages.

Problem 1
    - Root composer.json requires php ^7.1.3 but your php version (8.1.0) does not satisfy that requirement.
  Problem 2
    - laravel/framework[v5.7.0, ..., 5.7.x-dev] require php ^7.1.3 -> your php version (8.1.0) does not satisfy that requirement.
    - Root composer.json requires laravel/framework 5.7.* -> satisfiable by laravel/framework[v5.7.0, ..., 5.7.x-dev].

I tried to change it from composer.json but still doesn't works also I tried to composer install --ignore-platform-reqs gives me other error which is :

Generating optimized autoload files
Class Egulias\EmailValidator\Exception\ExpectedQPair located in C:/laravel/job-portal-website-in-laravel-master/vendor/egulias/email-validator/EmailValidator\Exception\ExpectingQPair.php does not comply with psr-4 autoloading standard. Skipping.
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
Deprecation Notice: Return type of Illuminate\Container\Container::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php:1204
Deprecation Notice: Return type of Illuminate\Container\Container::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php:1215
Deprecation Notice: Return type of Illuminate\Container\Container::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php:1227
Deprecation Notice: Return type of Illuminate\Container\Container::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php:1240
> @php artisan package:discover

Deprecated: Return type of Illuminate\Container\Container::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php on line 1204

Deprecated: Return type of Illuminate\Container\Container::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php on line 1215

Deprecated: Return type of Illuminate\Container\Container::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php on line 1227

Deprecated: Return type of Illuminate\Container\Container::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php on line 1240

Deprecated: Method ReflectionParameter::getClass() is deprecated in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php on line 833

Deprecated: Method ReflectionParameter::getClass() is deprecated in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php on line 907

Deprecated: Method ReflectionParameter::getClass() is deprecated in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php on line 833

Deprecated: Method ReflectionParameter::getClass() is deprecated in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Container\Container.php on line 907

Deprecated: Return type of Illuminate\Config\Repository::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Config\Repository.php on line 141

Deprecated: Return type of Illuminate\Config\Repository::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\laravel\job-portal-website-in-laravel-master\vendor\laravel\framework\src\Illuminate\Config\Repository.php on line 152

Deprecated: Return type of Illuminate\Config\Repository::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute shou......ect.

so do you have idea how should I mage that error? can someone help???

via Chebli Mohamed