fix: add autoware_utils to build_depends.repos

Signed-off-by: Ryohsuke Mitsudome <ryohsuke.mitsudome@tier4.jp>

Author: mitsudome-r

build_depends.repos

@@ -7,6 +7,10 @@ repositories:
     type: git
     url: https://github.com/autowarefoundation/autoware.core.git
     version: main
+  core/autoware_utils:
+    type: git
+    url: https://github.com/autowarefoundation/autoware_utils.git
+    version: main
   msgs/autoware_msgs:
     type: git
     url: https://github.com/autowarefoundation/autoware_msgs.git