[Bug]: v1.x - PHP 8.1 compat

[Chrico]

Description of the bug

Right now the version 1.x of Wonolog is not compatible to PHP 8.1 and shows several deprecated notices. As an example:

Deprecated: Return type of Inpsyde\Wonolog\Processor\ProcessorsRegistry::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] 


Deprecated: Constant Inpsyde\Wonolog\Data\FILTER_SANITIZE_STRING is deprecated in inpsyde\wonolog\src\PhpErrorController.php on line 100


Deprecated: Return type of Inpsyde\Wonolog\Handler\HandlersRegistry::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice

Reproduction instructions

Expected behavior

We should fix those and also make use of our reusable workflows for lint-php to detect such errors earlier for v1.x and v2.x.

Environment info

No response

Relevant log output

No response

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct