Periodically sync dependency versions with main Jib repo

[chanseokoh]

Most of the dependencies need to be sync'ed with the main Jib repo.

  /* PROJECT DEPENDENCY VERSIONS */
  // define all common versioned dependencies here
  project.ext.dependencyVersions = [
    GUAVA: '28.1-jre',
    JSR305: '3.0.2', // transitively pulled in by GUAVA

    JIB_CORE: '0.15.0',
    JIB_GRADLE: '2.4.0',

    // for Build Plan and Jib Plugins Extension API
    JIB_GRADLE_EXTENSION: '0.4.0',
    JIB_MAVEN_EXTENSION: '0.4.0',

    SPRING_BOOT: '2.3.1.RELEASE', // for Spring Boot Gradle extension
    MAVEN_API: '3.5.2',

    //test
    JUNIT: '4.12',
    MOCKITO_CORE: '3.2.4',
    SLF4J_API: '1.7.25',
    SYSTEM_RULES: '1.19.0',
  ]
  /* PROJECT DEPENDENCY VERSIONS */

[loosebazooka]

github action?