Bump actions/upload-artifact from 4.1.0 to 4.2.0

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4.1.0...v4.2.0)

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

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

.github/workflows/build-snap.yml

@@ -25,7 +25,7 @@ jobs:
           sg lxd -c 'snapcraft --use-lxd'
           sudo mv k8s-dqlite*.snap k8s-dqlite.snap
       - name: Uploading snap
-        uses: actions/upload-artifact@v4.1.0
+        uses: actions/upload-artifact@v4.2.0
         with:
           name: .snap
           path: k8s-dqlite.snap