[GR-13583] Release GraalVM 1.0.0-rc12.

Author: ansalond

mx.graalpython/suite.py

@@ -9,7 +9,7 @@
     "versionConflictResolution": "latest",
 
     "version": "1.0.0-rc12",
-    "release": False,
+    "release": True,
     "groupId": "org.graalvm.graalpython",
     "url": "http://www.graalvm.org/",