chore(deps): update dependency google-cloud-storage-transfer to v1.2.0 (GoogleCloudPlatform#7538)

Co-authored-by: Dan Lee <71398022+dandhlee@users.noreply.github.com>

Author: renovate-bot

storagetransfer/requirements.txt

@@ -1,4 +1,4 @@
-google-cloud-storage-transfer==1.1.1
+google-cloud-storage-transfer==1.2.0
 google-api-python-client==2.39.0
 google-auth==2.5.0
 google-auth-httplib2==0.1.0