Bump game-ci/unity-test-runner from 2 to 4

Bumps [game-ci/unity-test-runner](https://github.com/game-ci/unity-test-runner) from 2 to 4.
- [Release notes](https://github.com/game-ci/unity-test-runner/releases)
- [Commits](game-ci/unity-test-runner@v2...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/main.yml

@@ -42,7 +42,7 @@ jobs:
           restore-keys: |
             Library-${{ matrix.targetPlatform }}
             Library-
-      - uses: game-ci/unity-test-runner@v2
+      - uses: game-ci/unity-test-runner@v4
         id: testRunner
         with:
           githubToken: ${{ secrets.GITHUB_TOKEN }}