Update actions/upload-artifact action to v7

Author: renovate[bot]

.github/workflows/firebase_functions.yml

@@ -30,7 +30,7 @@ jobs:
 
       - name: Upload npm logs
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: npm-logs
           path: "~/.npm/_logs/**/*"

.github/workflows/flutter.yml

@@ -36,7 +36,7 @@ jobs:
           ./tool/build.sh
           flutter test --coverage
       - run: flutter test --coverage
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         if: failure()
         with:
           name: failures