Bump actions/labeler from 5 to 6

Bumps [actions/labeler](https://github.com/actions/labeler) from 5 to 6.
- [Release notes](https://github.com/actions/labeler/releases)
- [Commits](actions/labeler@v5...v6)

---
updated-dependencies:
- dependency-name: actions/labeler
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/pr-labeler.yml

@@ -14,6 +14,6 @@ jobs:
       - uses: actions/checkout@v5
         with:
           repository: 'gitbutlerapp/gitbutler'
-      - uses: actions/labeler@v5
+      - uses: actions/labeler@v6
         with:
           configuration-path: '.github/pr-labeler.yml'