feat(autoware.repos): patch update autowarefoundation/autoware_lanelet2_extension to 0.6.4 (#5989)

Author: awf-autoware-bot[bot]

autoware.repos

@@ -24,7 +24,7 @@ repositories:
   core/autoware_lanelet2_extension:
     type: git
     url: https://github.com/autowarefoundation/autoware_lanelet2_extension.git
-    version: 0.6.3
+    version: 0.6.4
   core/autoware_core:
     type: git
     url: https://github.com/autowarefoundation/autoware_core.git