chore: set mmlc version to stable 1.21.1

RobinTheHood · RobinTheHood · commit 0a272948ddbe · 2023-11-24T11:06:00.000+01:00
diff --git a/config/version.json b/config/version.json
@@ -1 +1 @@
-{"version": "1.21.0"}
+{"version": "1.21.1"}
