undo 2.13 on sync

Author: nikhil-zlai

.bazelrc

@@ -9,8 +9,8 @@ common:scala_2.13 --define=SCALA_VERSION=2.13.12
 # Default scala version to 2.12
 # To set a different default Scala version, add the following to .bazelrc.local:
 # common --config scala_2.12
-common --repo_env=SCALA_VERSION=2.13.12
-common --define=SCALA_VERSION=2.13.12
+common --repo_env=SCALA_VERSION=2.12.18
+common --define=SCALA_VERSION=2.12.18
 
 build --java_language_version=11
 build --java_runtime_version=11