build(deps): bump com.formdev:flatlaf-extras in /serverpackcreator-app

Bumps [com.formdev:flatlaf-extras](https://github.com/JFormDesigner/FlatLaf) from 3.5.2 to 3.6.
- [Release notes](https://github.com/JFormDesigner/FlatLaf/releases)
- [Changelog](https://github.com/JFormDesigner/FlatLaf/blob/main/CHANGELOG.md)
- [Commits](https://github.com/JFormDesigner/FlatLaf/compare/3.5.2...3.6

)

---
updated-dependencies:
- dependency-name: com.formdev:flatlaf-extras
  dependency-version: '3.6'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>