chore(deps): update actions/upload-artifact action to v6

Author: renovate[bot]

.github/workflows/release-please.yml

@@ -55,7 +55,7 @@ jobs:
             --target rpm
 
       - name: upload output artifacts as release artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         with:
           name: ublue-updater-rpms
           path: output/