DOC: upgrade sphinx to latest version and enable automated upgrades for doc dependencies

.circleci/config.yml

@@ -53,7 +53,7 @@ commands:
 
             # install yt_astro_analysis with extra dev dependencies
             python -m pip install .
-            python -m pip install --requirement test_requirements.txt
+            python -m pip install --requirement requirements/tests.txt
 
             # configure yt
             mkdir -p $HOME/.config/yt # avoid a warning from yt
@@ -117,7 +117,7 @@ commands:
           command: |
             source $HOME/venv/bin/activate
             python -m pip install --upgrade pip
-            python -m pip install --requirement doc/requirements.txt
+            python -m pip install --requirement requirements/docs.txt
             cd doc/source
             python -m sphinx -M html "." "_build" -W
 

.github/dependabot.yml

@@ -1,5 +1,10 @@
 version: 2
 updates:
+- package-ecosystem: pip
+  directory: /requirements
+  schedule:
+    interval: monthly
+
 - package-ecosystem: github-actions
   directory: /.github/workflows
   schedule:

.readthedocs.yml

@@ -14,4 +14,4 @@ build:
 
 python:
     install:
-    - requirements: doc/requirements.txt
+    - requirements: requirements/docs.txt

doc/requirements.txt → requirements/docs.txt

@@ -1,4 +1,5 @@
-sphinx==4.5.0
+. # install yt_astro_analysis
+sphinx==7.2.6
 sphinx-bootstrap-theme==0.8.1
 jinja2==3.1.2
 markupsafe==2.1.3