Pin swag to 1.6.7 (#4694)

Author: nwmac

build/bk-build.sh

@@ -34,7 +34,7 @@ go env
 
 # Need to install swag in both cases
 echo "Generating OpenAPI documentation..."
-go get github.com/swaggo/swag/cmd/swag
+go get github.com/swaggo/swag/cmd/swag@v1.6.7
 swag init
 
 if [ "${ACTION}" == "build" ]; then