Try using conda-lock.yml to build JupyterBook

Use dependencies from lockfile rather than environment.yml file.

.github/workflows/deploy-book.yml

@@ -33,7 +33,7 @@ jobs:
       uses: conda-incubator/[email protected]
       with:
         activate-environment: egu22pygmt
-        environment-file: environment.yml
+        environment-file: conda-lock.yml
         python-version: ${{ matrix.python-version }}
         channels: conda-forge
         channel-priority: strict