[TASK] Remove deprecated PluginEnhancer::getNamespacedRequirements

Method is marked deprecated since v10 and can be removed in v11.

Resolves: #94781
Releases: master
Change-Id: Ibd1211289365ddde5b29de0006f2e1116112d7e7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70400


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>