Try to downgrade e-adr

[koppor]

Fixes #14034

Will probably not work, because @ADR was introduced in the 2.x series - https://github.com/adr/e-adr/blob/main/CHANGELOG.md

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• [/] I manually tested my changes in running JabRef (always required)
• [/] I added JUnit tests for changes (if applicable)
• [/] I added screenshots in the PR description (if change is visible to the user)
• [/] I described the change in CHANGELOG.md in a way that is understandable for the average user (if change is visible to the user)
• [/] I checked the user 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 updating file(s) in https://github.com/JabRef/user-documentation/tree/main/en.

[Siedlerchr]

Better idea: We put the jar inside the libs folder

[koppor]

Follow-up #14043