Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci.yml

@@ -44,7 +44,7 @@ jobs:
       - name: "✅ Test"
         run: flutter test --coverage
       - name: "📤 Upload test coverage report"
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: "Test coverage report"
           path: coverage/lcov.info
@@ -55,12 +55,12 @@ jobs:
           token: ${{secrets.CODECOV_TOKEN}}
           file: coverage/lcov.info
       - name: "📤 Upload Android App Bundle"
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: "Android App Bundle"
           path: build/app/outputs/bundle/release/app-release.aab
       - name: "📤 Upload Android APK"
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: "Android APK"
           path: build/app/outputs/apk/release/app-release.apk