Remove mamba list command

Packages are listed under setup-micromamba action already.

Author: weiji14

.github/workflows/deploy-book.yml

@@ -41,10 +41,6 @@ jobs:
             - conda-forge
             - nodefaults
 
-    # Show installed pkg information for postmortem diagnostic
-    - name: List installed packages
-      run: mamba list
-
     # Build the book
     - name: Build the book
       run: jupyter-book build book/