With IntelliJ 2022, I have issues with CRLF (IntelliJ) and LF (git config) line endings. With this PR, I kind of follow the recommendation from https://stackoverflow.com/a/42135910/873282 to have all source code files having the same line endings.

• 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.