Build Cache for Gradle v2.20.4

What’s Changed

  • Bump bitrise-build-cache-cli to v2.6.7 — runtime opt-out for the Bitrise Gradle mirrors init script: setting BITRISE_MAVENCENTRAL_PROXY_ENABLED=false (via Secrets, step inputs, or app config) now disables the mirrors at Gradle build time, even when the init script is already installed (ACI-4939).