fixed indentation, removed matrix stuff

.github/workflows/autotest.yml

@@ -9,18 +9,14 @@ on:
 jobs:
   run-test-suite:
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        python-version: '3.12'
 
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v3
       - name: Set up Python 3.12
-      - uses: actions/setup-python@v4
+        uses: actions/setup-python@v3
         with:
-          python-version: 3.12
+          python-version: "3.12"
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip