[TASK] Prepare for TYPO3 12

requested review from @sgalinski

assigned to @kditscheid

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• 5d37062d - [TASK] Update copyright

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• b80e725a - [TASK] Rector and ECS run

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• c92a74c8 - [TASK] Cleanup, Rector, ECS, Plugin preview fixes

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• 730a555c - [BUGFIX] Fix access to protected method

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• 153db594 - [TASK] Remove unused import

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• 24c6c8cf - [TASK] Fix extension scanner issues

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• d83afd8e - [BUGFIX] Fix some issues in the code discovered with phpstan

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• 1ef898e5 - [TASK] Inject plugin controller manually

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• 95e42469 - [TASK] Update the Upgrade instructions

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• 80429ac0 - [BUGFIX] Add missing row, because gridelements complains with a warning

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mentioned in commit 6d592c17

merged