remove code quality tests under Julia nightly (qutip#237)

Author: ytdHuang

.github/workflows/CI-Julia-nightly.yml

@@ -46,7 +46,6 @@ jobs:
           - 'x64'
         group:
           - 'Core'
-          - 'Code-Quality'
 
     steps:
       - uses: actions/checkout@v4