Remove unneeded installs from zipapp ci tests

Author: notatallshaw

.github/workflows/ci.yml

@@ -230,7 +230,7 @@ jobs:
           sudo apt-get update
           sudo apt-get install bzr
 
-      - run: pip install nox 'virtualenv<20' 'setuptools != 60.6.0'
+      - run: pip install nox
 
       # Main check
       - name: Run integration tests