Issue #3555329: Fix deprecation by making parameter explicitly nullable in...

Jatin Sinwariarequested to merge
issue/bibcite-3555329:3555329-deprecated-drupalbibciteentityreferenceaccesscontrolhandlercheckfieldaccess-implicitly into 3.0.x

Issue #3555329: Fix deprecation by making parameter explicitly nullable in ReferenceAccessControlHandler::checkFieldAccess().

Closes #3555329

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