CI: check comment author association instead of issue author (#1255)

Author: arjxn-py

.github/workflows/update_galata_references.yml

@@ -16,9 +16,9 @@ jobs:
   update-snapshots:
     if: >
       (
-        github.event.issue.author_association == 'OWNER' ||
-        github.event.issue.author_association == 'COLLABORATOR' ||
-        github.event.issue.author_association == 'MEMBER'
+        github.event.comment.author_association == 'OWNER' ||
+        github.event.comment.author_association == 'COLLABORATOR' ||
+        github.event.comment.author_association == 'MEMBER'
       ) && github.event.issue.pull_request && contains(github.event.comment.body, 'please update snapshots')
     runs-on: ubuntu-latest