checked_yaml: drop dep overrides (#1266)

Author: kevmoo

checked_yaml/pubspec.yaml

@@ -22,8 +22,8 @@ dev_dependencies:
   test: ^1.16.0
   test_process: ^2.0.0
 
-dependency_overrides:
-  json_annotation:
-    path: ../json_annotation
-  json_serializable:
-    path: ../json_serializable
+#dependency_overrides:
+#  json_annotation:
+#    path: ../json_annotation
+#  json_serializable:
+#    path: ../json_serializable