Fix ci

Author: haneslinger

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         tox_env: [python] #, precommit]
@@ -31,7 +31,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v3
         with:
-          python-version: "3.7"
+          python-version: "3.6.7"
       - name: Display system info
         run: python -c "import sys; print(sys.version)"
       - name: Setup Python