Fix implicit nullable types - #290
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This behavior has been been [deprecated since PHP 8.4](https://wiki.php.net/rfc/deprecate-implicitly-nullable-types). This has no impact on the rest of the code. This does not seem to be a breaking change as PHP already internally converts the method signature from e.g. `callable` to `?callable` when it detects an implicitly nullable parameter. Therefore, the method signatures are "the same" and code that overrides these methods is not affected.
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This behavior has been been deprecated since PHP 8.4. This has no impact on the rest of the code.
This does not seem to be a breaking change as PHP already internally converts the method signature from e.g.
callableto?callablewhen it detects an implicitly nullable parameter. Therefore, the method signatures are "the same" and code that overrides these methods is not affected.