Update fetch-external.yml

Author: alistairwheeler

.github/workflows/fetch-external.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Clone community-solved-topics repo
         run: |
           rm -rf external_solved_topics
-          git clone --single-branch --branch master https://github.com/simplicitesoftware/community-solved-topics.git external_solved_topics
+          git clone  https://github.com/simplicitesoftware/community-solved-topics.git external_solved_topics
           
       - name: Commit and push changes
         run: |