Updated: Addon-Checker Python version pinned.

Author: basrieter

.github/workflows/addon-checker.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: '3.x'
+        python-version: '3.12'
 
     - name: Install dependencies
       run: |