* Upgrade to Truth 1.0 Refactored fail(...) to assertWithMessage().fail(). Upgraded com.google.monitoring-client family of dependencies to 1.0.6 Also fixed bad use of io.StringIO (on binary buffer) recently introduced to google-java-format-diff.py.
This PR also upgraded the version of Guava to 28.1-jre to resolve missing stream package issue.
This is a preparation for replacing the deprecated GoogleCredential library.