Bump actions/upload-artifact from 5 to 6

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

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

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

Author: dependabot[bot]

.github/workflows/pull-request-ci.yml

@@ -72,7 +72,7 @@ jobs:
       - name: Code checks
         run: ./gradlew check
       - name: Archive Lint report
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: ${{ always() }}
         with:
           name: Matomo-Lint-${{ needs.env-job.outputs.modified-branch-name }}
@@ -120,7 +120,7 @@ jobs:
           abi: ${{ matrix.abi }}
           cmdOptions: -noaudio -no-boot-anim -no-window -metrics-collection
       - name: Archive Espresso results
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: ${{ always() }}
         with:
           name: matomo-Espresso-${{ needs.env-job.outputs.modified-branch-name }}