Prepare Update Java JDK from 21 to 22

[koppor]

Refs https://github.com/JabRef/jabref-issue-melting-pot/issues/669

Mandatory checks

• I own the copyright of the code submitted and I licence it under the MIT license
• Change in CHANGELOG.md described in a way that is understandable for the average user (if change is visible to the user)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

[Siedlerchr]

shouldn't EA become 24 then?

[koppor]

Not supported by the current workflow. I can re-add this, but takes 30 to 60 min again - need to switch to Oracle action etc.

[Siedlerchr]

Unsupported class file major version 67

[koppor]

Blocked by beryx/badass-jlink-plugin#275.

I don't want to use a patched version of the jlink plugin. Thus, I close this PR.

[koppor]

Since I also improved the links for updating and we should try if all dependencies work with a JDK "close enough" to JDK23, I "downgraded" to JDK 22 in this "upgrade"

[Siedlerchr]

JDK 22 does not make sense, it's obsolete with the release of 23.

[koppor]

JDK 22 does not make sense, it's obsolete with the release of 23.

Ah, yeah, I totally forgot.

Now, I just have the documentation updates in - and some small version adaptions.

[calixtus]

21.0.5 ?

[github-actions]

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