Merge pull request #2723 from mozilla/basti/update_ci

Update CI actions/upload-artifact to v4

Author: dannycolin

.github/workflows/builds.yaml

@@ -26,7 +26,7 @@ jobs:
           ./bin/build-addon.sh nightly.xpi
 
       - name: Uploading
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
             name: ${{matrix.config.name}} Build
             path: src/web-ext-artifacts