* 5.4:
  [Filesystem] Fix str_contains deprecation
  [Security] Correctly initialize the voter property
  [FrameworkBundle] Fix typo
  Update `changed-translation-files` step with native git diff command
  [Lock] Check the correct SQLSTATE error code for MySQL
  [ErrorHandler] Fix `ErrorHandlerTest::tearDown()` visibility
  [Lock] compatiblity with redis cluster 7
  fix: typo

… (alexandre-daubois)

This PR was merged into the 5.4 branch.

Discussion
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Add more explicit nullable types for default null values

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

Continuing to bring deprecation-free support for PHP 8.4 (https://php.watch/versions/8.4/implicitly-marking-parameter-type-nullable-deprecated)

If this gets merged, I'll take care of adding missing ones in upper branches if not done during upmerge 🙂

Commits
-------

e9d30bac03 Add more explicit nullable types for default null values

* 5.4:
  Make more nullable types explicit
  Add more explicit nullable types for default null values

* 5.4:
  preserve the file modification time when mirroring directories
  use local PHP web server to test HTTP stream wrappers