upd buf.gen.yaml

Author: gertd

buf.gen.yaml

@@ -14,7 +14,7 @@ plugins:
     opt:
       - html,index.html
 
-  - remote: buf.build/grpc-ecosystem/openapiv2:v2.27.4
+  - remote: buf.build/grpc-ecosystem/openapiv2:v2.27.7
     out: ./tmp
     opt:
       - json_names_for_fields=false  # use proto names.