Update actions/upload-artifact action to v4 (#82)

Author: renovate[bot]

.github/workflows/build.yml

@@ -25,7 +25,7 @@ jobs:
         run: npm run build-webextension
 
       - name: Upload Artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: web-ext-artifacts
           path: web-ext-artifacts