feat(repositories/autoware.repos): minor update autowarefoundation/autoware_lanelet2_extension to 0.12.0 (#6824)

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Author: awf-autoware-bot[bot]

repositories/autoware.repos

@@ -23,7 +23,7 @@ repositories:
   core/autoware_lanelet2_extension:
     type: git
     url: https://github.com/autowarefoundation/autoware_lanelet2_extension.git
-    version: 0.11.0
+    version: 0.12.0
   core/autoware_core:
     type: git
     url: https://github.com/autowarefoundation/autoware_core.git