Fix CI runner version

Author: javieraspuru-ax

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Compile
         run: poetry run mypy .
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
         uses: actions/checkout@v3
@@ -39,7 +39,7 @@ jobs:
   publish:
     needs: [compile, test]
     if: github.event_name == 'push' && contains(github.ref, 'refs/tags/')
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
         uses: actions/checkout@v3