Bump reactivecircus/android-emulator-runner from 2.20.0 to 2.21.0

Bumps [reactivecircus/android-emulator-runner](https://github.com/reactivecircus/android-emulator-runner) from 2.20.0 to 2.21.0.
- [Release notes](https://github.com/reactivecircus/android-emulator-runner/releases)
- [Changelog](https://github.com/ReactiveCircus/android-emulator-runner/blob/main/CHANGELOG.md)
- [Commits](https://github.com/reactivecircus/android-emulator-runner/compare/v2.20.0...v2.21.0)

---
updated-dependencies:
- dependency-name: reactivecircus/android-emulator-runner
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
           java-version: '11'
 
       - name: run tests
-        uses: reactivecircus/android-emulator-runner@v2.20.0
+        uses: reactivecircus/android-emulator-runner@v2.21.0
         with:
           api-level: ${{ matrix.api-level }}
           target: ${{ matrix.target }}