add java install to gradle wrapper action

[Siedlerchr]

Closes #_____

In about one to three sentences, describe the changes you have made: what, where, why, ...

Steps to test

Describe how reviewers can test this fix/feature. Ideally, think of how you would guide a beginner user of Jabef to try out your change.
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Mandatory checks

• I own the copyright of the code submitted and I license 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 (if change is visible to the user)
• [.] 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.

[trag-bot]

@trag-bot didn't find any issues in the code! ✅✨

[koppor]

Why is this necessary? The action successfully ran without a java installation -> https://github.com/JabRef/jabref/actions/runs/15384215061/job/43279810420

[Siedlerchr]

No, the action did not run successfully without the set up: #13281 (comment)
Original run: https://github.com/JabRef/jabref/actions/runs/15527196491/job/43709039773

[koppor]

No, the action did not run successfully without the set up: #13281 (comment)
Original run: https://github.com/JabRef/jabref/actions/runs/15527196491/job/43709039773

The link goes to a different workflow, not the gradle update

[koppor]

All old runs green: https://github.com/JabRef/jabref/actions/workflows/update-gradle-wrapper.yml

[Siedlerchr]

Odd. Then why did the build not work?

[koppor]

Odd. Then why did the build not work?

GitHub actions hickup. And the binaries workflow had issues. Not the gradle update aciton workflow. These are two different files!

I will file a PR as soon as I have battery power again.

[koppor]

All binaries failed:

I think, gradle server rejected calls:

Resource missing. [HTTP HEAD: https://plugins.gradle.org/m2/org/gradle/toolchains/foojay-resolver-convention/org.gradle.toolchains.foojay-resolver-convention.gradle.plugin/1.0.0/org.gradle.toolchains.foojay-resolver-convention.gradle.plugin-1.0.0.jar]