Print all installed packages in the pytest CI

This makes it much easier to compare package versions between runs to
see if an update is causing any failures, rather than having to trawl
through the install logs.

.github/workflows/pytest-all.yml

@@ -39,10 +39,16 @@ jobs:
 
       - name: Print system info
         run: |
+          echo '::group::NumPy'
           pip install threadpoolctl &>/dev/null
           python -c "import sys, numpy; print(numpy.__version__); print(sys.version); print(numpy.show_runtime())"
-          echo
+          echo '::endgroup::'
+          echo '::group::CPU info'
           lscpu
+          echo '::endgroup::'
+          echo '::group::Package versions'
+          pip list --format=freeze
+          echo '::endgroup::'
 
       - name: Run tests with pytest
         run: pytest -v -s --nbval --cov=pynucastro --color=yes