PHP 8.1 compatibility. Multiple warnings [#3355038]

while using phpstan tool, many deprecation issues were found in following files:

service_container/lib/Drupal/Component/Plugin/LazyPluginCollection.php
service_container/modules/providers/service_container_annotation_discovery/lib/Doctrine/common/lib/Doctrine/Common/Reflection/RuntimePublicReflectionProperty.php
service_container/modules/providers/service_container_annotation_discovery/lib/Doctrine/common/lib/Doctrine/Common/Reflection/StaticReflectionClass.php
service_container/modules/providers/service_container_annotation_discovery/lib/Doctrine/common/lib/Doctrine/Common/Reflection/StaticReflectionMethod.php
service_container/modules/providers/service_container_annotation_discovery/lib/Doctrine/common/lib/Doctrine/Common/Reflection/StaticReflectionProperty.php

The root cause of all issues is the same: Return type of method is not covariant with tentative return type of parent method.

Update return type to match the root method return type or use the #[\ReturnTypeWillChange] attribute to temporarily suppress the error.

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3355038-php-8.1-compatibility changes, plain diff MR !1
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