Bump buildpacks/gradle/test-apps/heroku-gradle-getting-started (#752)

Bumps [buildpacks/gradle/test-apps/heroku-gradle-getting-started](https://github.com/heroku/gradle-getting-started) from `2542fad` to `506f247`.
- [Commits](heroku/gradle-getting-started@2542fad...506f247)

---
updated-dependencies:
- dependency-name: buildpacks/gradle/test-apps/heroku-gradle-getting-started
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]