fix github ci

Author: venthur

.github/workflows/python-package.yaml

@@ -34,8 +34,7 @@ jobs:
         # ensure we're using *our* dotenv during testing and not some other one
         # installed on the system, e.g. gh machines apparently have sometimes
         # the ruby dotenv package installed
-        pip install --upgrade -r requirements-dev.txt
-        pip install -e .['dev']
+        pip install --upgrade -e .['dev']
         make test
 
   lint: