Build/Test: update Props Bot to correct event type

The proper name is the plural `types`. This will cause the action to run only when necessary. Very Demure. Very mindful.

Ref: https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#issue_comment

Props jeherve.
Fixes #61883


git-svn-id: https://develop.svn.wordpress.org/trunk@58903 602fd350-edb4-49c9-b593-d223f7449a82

Author: aaronjorbin

.github/workflows/props-bot.yml

@@ -18,7 +18,7 @@ on:
   # You cannot filter this event for PR comments only.
   # However, the logic below does short-circuit the workflow for issues.
   issue_comment:
-    type:
+    types:
       - created
   # This event will run everytime a new PR review is initially submitted.
   pull_request_review: