chore(deps): update dependency google-cloud-video-stitcher to v0.2.1 (#56)

Author: renovate-bot

video/stitcher/requirements.txt

@@ -1,3 +1,3 @@
 google-api-python-client==2.56.0
 grpcio==1.48.0
-google-cloud-video-stitcher==0.2.0
+google-cloud-video-stitcher==0.2.1