Update run-layout-tests.yml

.github/workflows/run-layout-tests.yml

@@ -45,17 +45,17 @@ jobs:
           files: ./coverage.xml
           fail_ci_if_error: true
 
-      - name: setup python 3.9
+      - name: setup python 3.7
         uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          python-version: '3.7'
           cache: "pip"
           cache-dependency-path: pyproject.toml
 
-      - name: install python 3.9 packages
+      - name: install python 3.7 packages
         run: |
           python -m pip install --upgrade pip
           pip install klayout numpy scipy pytest pytest-cov
 
-      - name: Test with pytest, python 3.9
+      - name: Test with pytest, python 3.7
         run: pytest klayout_dot_config/tech