Deprecated function: Drupal\votingapi\VoteAccessControlHandler::checkFieldAccess(): Implicitly marking parameter $items as nullable is deprecated, the explicit nullable type must be used instead

Problem/Motivation

On PHP 8.4+, Drupal logs a deprecation warning from Voting API:

Deprecated function: Drupal\votingapi\VoteAccessControlHandler::checkFieldAccess(): Implicitly marking parameter $items as nullable is deprecated, the explicit nullable type must be used instead.

Steps to reproduce

1. Run a Drupal site with Voting API enabled on PHP 8.5
2. Login with elevated role and access the page /admin/content/vote.
3. Observe deprecation message mentioned above

Proposed resolution

Update the method signature in VoteAccessControlHandler::checkFieldAccess()

- Replace implicit nullable style:
SomeType $items = NULL
- With explicit nullable style:
?SomeType $items = NULL

Also review related overrides in the module for similar implicit nullable typed parameters and update them for PHP 8.4 compatibility.

Remaining tasks

None.

User interface changes

None.

API changes

None.

Data model changes

None.