chore: fix diff comment action

[mrgrain]

Fixes Action failing with

Warning: Unexpected input(s) 'comment_tag', valid inputs are ['message', 'file-path', 'github-token', 'reactions', 'pr-number', 'comment-tag', 'mode', 'create-if-not-exists']
Run thollander/actions-comment-pull-request@v3
Error: Resource not accessible by integration

[github-actions]

@aws-cdk/aws-service-spec: No model change detected