remove powershell from daily build

Author: robertjwilson

.github/workflows/python-app-daily.yml

@@ -28,7 +28,6 @@ jobs:
           create-args: cdo=2.4.0 nco cartopy python=3.13
           init-shell: >-
             bash
-            powershell
           cache-environment: true
           post-cleanup: 'all'
       - name: Install dependencies