Update docs deps and theme

.github/workflows/docs.yml

@@ -15,7 +15,7 @@ jobs:
         shell: bash
     steps:
       - name: Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.11.0
+        uses: styfle/cancel-workflow-action@0.12.0
         with:
           access_token: ${{ github.token }}
 
@@ -29,7 +29,7 @@ jobs:
         uses: actions/cache@v3
         env:
           # Increase this to reset the cache if the key hasn't changed.
-          CACHE_NUM: 1
+          CACHE_NUM: 3
         with:
           path: |
             /usr/share/miniconda/envs/anaconda-client-env

docs/_config.yml

@@ -36,11 +36,9 @@ sphinx:
     - sphinxarg.ext
 
     config:
-      html_theme: tskit_book_theme
+      html_theme: sphinx_book_theme
       html_theme_options:
-        pygment_light_style: monokai
         pygment_dark_style: monokai
-      pygments_style: monokai
       issues_github_path: tskit-dev/pyslim
       todo_include_todos: true
       intersphinx_mapping:

requirements/CI-docs/requirements.txt

@@ -1,15 +1,10 @@
-setuptools-scm==7.1.0
 jupyter-book==0.15.1
-jupyter-sphinx==0.4.0
-sphinx==5.0.2
-tskit==0.5.5
+matplotlib==3.8.0
 msprime==1.2.0
-PyGithub==1.58.2
-matplotlib==3.7.1
-pandas
-tskit-book-theme
-
-jupyter-book==0.15.1
-sphinx-issues==3.0.1
+msprime==1.2.0
+pandas==2.1.1
+PyGithub==2.1.1
+setuptools-scm==8.0.4
 sphinx-argparse==0.4.0
-msprime==1.2.0
+sphinx-issues==3.0.1
+tskit==0.5.5