Bump fsfe/reuse-action from 5 to 6

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

---
updated-dependencies:
- dependency-name: fsfe/reuse-action
  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/build.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: REUSE Compliance Check
-        uses: fsfe/reuse-action@v5
+        uses: fsfe/reuse-action@v6
   tests:
     needs: [checks]
     runs-on: ${{ matrix.os }}