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This thread is resolved. Here is a description of the problem and solution.
Problem: Client never used some languages like de_DE, fr_FR, it_IT etc. but those languages receive updates in the WordPress updater.
Solution: Simply delete unused langauge packages from wp-content/languages. This should revent that the language updates will be executed.
Relevant Documentation: https://hexad.org/dev/wordpress-stop-unused-language-updates