Update showcase dependency (#252)

Author: software-dov

packages/gapic-generator/.circleci/config.yml

@@ -166,7 +166,7 @@ jobs:
   showcase:
     docker:
       - image: python:3.8-slim
-      - image: gcr.io/gapic-images/gapic-showcase:0.2.0
+      - image: gcr.io/gapic-images/gapic-showcase:0.6.1
     steps:
       - checkout
       - run:

packages/gapic-generator/noxfile.py

@@ -19,7 +19,7 @@
 import nox  # type: ignore
 
 
-showcase_version = '0.2.0'
+showcase_version = '0.6.1'
 
 
 @nox.session(python=['3.6', '3.7', '3.8'])