message: Fix event source for S3 put events
diff: @@ -27,7 +27,7 @@ def handler(event, _context):
  unsubmitted_roots = get_all_unsubmitted_roots(config)
  for index, row in unsubmitted_roots.iterrows():
  process_file(row["file"], config)
  - elif event["Records"][0]["eventSource"] == "aws.s3":
  + elif event["Records"][0]["eventSource"] == "aws:s3":
  bucket = event["Records"][0]["s3"]["bucket"]["name"]
  key = urllib.parse.unquote_plus(
  event["Records"][0]["s3"]["object"]["key"], encoding="utf-8"
  