[skip ci] Update actions/upload-artifact action to v4 (#249)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/firebase_functions.yml

@@ -30,7 +30,7 @@ jobs:
 
       - name: Upload npm logs
         if: always()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: npm-logs
           path: "~/.npm/_logs/**/*"

.github/workflows/flutter.yml

@@ -35,7 +35,7 @@ jobs:
           ./tool/build.sh
           flutter test --coverage
       - run: flutter test --coverage
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: failures