switch back to powershell

Author: robertjwilson

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

@@ -28,6 +28,7 @@ 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