chore(deps): update dependency google-cloud-video-stitcher to v0.6.0 (#121)

Author: renovate-bot

video/stitcher/requirements.txt

@@ -1,3 +1,3 @@
 google-api-python-client==2.72.0
 grpcio==1.51.1
-google-cloud-video-stitcher==0.5.1
+google-cloud-video-stitcher==0.6.0