Release Java SDK v1.21.1 (#1844)

Author: Quinn-With-Two-Ns

releases/v1.21.1

@@ -0,0 +1,12 @@
+# Highlights
+
+## Bugfixes
+
+- Fixes a CRITICAL issue with `GetVersion` returning the wrong version on replay.
+Upgrade to this version instead of 1.21.0
+
+# Changeset
+
+2023-08-04 - 5ce6f10f - Replace interpolated variables (#1834)
+2023-08-14 - 622edc05 - Build test server on ubuntu 18 (#1836)
+2023-08-16 - f922c065 - Fix bug in VersionStateMachine causing wrong version to get returned (#1841)