[BUGFIX] Static method cannot be abstract

Releases: 6.1, 6.0
Fixes: #37539
Change-Id: I6b629579f7d6d7cfb3869e8fbc6ac4d218aab6be
Reviewed-on: https://review.typo3.org/26843
Reviewed-by: Oliver Klee
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel