This patch release includes a large number of bug fixes, including some critical fixes if using TLS communication.
sha256 for apache-geode-1.12.1.tgz is b7ab42433712ba52175393fae6614862e55f38516bd209cb2e54c1689afaf070
See full release notes at https://cwiki.apache.org/confluence/display/GEODE/Release+Notes#ReleaseNotes-1.12.1