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Update Java to version 21
Updates Java to version 21.
@da-Kai: FYI. I know you have been working on this as well. According to https://adoptium.net/de/supported-platforms/ Temurin is unfortunately currently not supporting "Linux (ARM 32-bit Hard-Float)" (armhf). We should validate this before continuing work on this PR.
https://github.com/adoptium/adoptium.net/blob/main/content/asciidoc-pages/supported-platforms/index.adoc
continue as #2890