Merge pull request PHP-DI#811 from PHP-DI/fix/php-81-serializable

PHP 8.1 support by requiring PHP 7.4 or up

Merge pull request PHP-DI#792 from rdarcy1/class-string-params

Add @template return types for better autocomplete/static analysis

Merge pull request PHP-DI#786 from martin-heralecky/atomic-create-com…

…pilation-directory

Atomic creation of compilation directory

Merge pull request PHP-DI#777 from rdarcy1/compiled-env-vars

Get env vars from $_ENV and $_SERVER in compiled container

Merge pull request PHP-DI#775 from martinssipenko/psr-exceptions

Make InvalidDefinition exception implement ContainerExceptionInterface

Merge pull request PHP-DI#757 from angelxmoreno/feature/754-replace-g…

…etenv

Feature/754 replace getenv

Update dev dependency

Merge pull request PHP-DI#737 from PHP-DI/php8

Support PHP 8

Fix PHP 8 attributes 🤦

Merge pull request PHP-DI#738 from PHP-DI/php8-attributes

Inject via PHP 8 attributes