Build Cache for Gradle v2.18.4

Changelog
1

What’s new

  • Update bitrise-build-cache-cli to v2.4.3.
  • Robolectric installation now goes through the Bitrise Maven Central mirror (sets robolectric.dependency.repo.url on Test tasks), so Robolectric’s runtime SDK fetch no longer hits Maven Central directly.
  • Gradle-plugins mirror URL is now gated on the supported-region allowlist — fixes Connect timed out failures for customer-private datacenters (e.g. GCP US_EAST4) where the Bitrise mirror host is unreachable.