build(deps): bump com.formdev:flatlaf-intellij-themes

Bumps [com.formdev:flatlaf-intellij-themes](https://github.com/JFormDesigner/FlatLaf) from 3.5.2 to 3.5.4.
- [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...3.5.4

)

---
updated-dependencies:
- dependency-name: com.formdev:flatlaf-intellij-themes
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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