fix runs on

Author: VMRuiz

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
     - uses: pre-commit/[email protected]
 
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     needs: lint
     strategy:
       matrix:
@@ -34,6 +34,7 @@ jobs:
         run: tox -e ${{ matrix.tox || 'py' }}
 
   publish:
+    runs-on: ubuntu-latest
     needs: test
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
     steps: