Bump game-ci/unity-test-runner from 3 to 4

Bumps [game-ci/unity-test-runner](https://github.com/game-ci/unity-test-runner) from 3 to 4.
- [Release notes](https://github.com/game-ci/unity-test-runner/releases)
- [Commits](game-ci/unity-test-runner@v3...v4)

---
updated-dependencies:
- dependency-name: game-ci/unity-test-runner
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/test.yml

@@ -81,7 +81,7 @@ jobs:
         run: echo "secret_key=UNITY_LICENSE_$(echo ${{ matrix.unityVersion }} | cut -c 1-4)" >> "$GITHUB_ENV"
 
       - name: Run tests
-        uses: game-ci/unity-test-runner@v3
+        uses: game-ci/unity-test-runner@v4
         with:
           githubToken: ${{ secrets.GITHUB_TOKEN }}
           unityVersion: ${{ matrix.unityVersion }}  # Default is `auto`