cis: test again vs pyvisa master branch

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install flake8 black isort mypy
-          pip install git+https://github.com/pyvisa/pyvisa.git@ext-rname#egg=pyvisa
+          pip install git+https://github.com/pyvisa/pyvisa.git
       - name: Isort
         run: |
           isort pyvisa_y -c;