Remove CONTRIBUTOR from author_association check in auto-answer-issues workflow

Co-authored-by: trwalke <30090357+trwalke@users.noreply.github.com>

Author: Copilot

.github/workflows/auto-answer-issues.yml

@@ -18,8 +18,7 @@ jobs:
     if: |
       github.event.issue.author_association == 'MEMBER' ||
       github.event.issue.author_association == 'OWNER' ||
-      github.event.issue.author_association == 'COLLABORATOR' ||
-      github.event.issue.author_association == 'CONTRIBUTOR'
+      github.event.issue.author_association == 'COLLABORATOR'
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4