Fix Windows build

[koppor]

Follow-up to #10004

It used to work, but suddenly gradle starts to complain:

Cannot locate tasks that match '.gradle.java.installations.paths=D:\a\_temp\jdk\jdk-21' as project '.gradle.java.installations.paths=D' not found in root project 'JabRef'.

Example: https://github.com/JabRef/jabref/actions/runs/5416997856/jobs/9847443571

This PR tries to fix that.

Mandatory checks

• Change in CHANGELOG.md described in a way that is understandable for the average user (if applicable)
• 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.

[koppor]

Merging, because it's a hotfix