Docs: update tooling

- Latest Sphinx 7.4.x
  (current sphinx-rtd-theme 2.x isn't yet compatible with Sphinx 8)
- Bump Pygments
- Update Python intersphinx to link to latest Python 3

docs/conf.py

@@ -273,7 +273,7 @@ extlinks = {
 # -- Options for Intersphinx ------------------------------------------------
 
 intersphinx_mapping = {
-    "python": ("https://docs.python.org/3.10", None),
+    "python": ("https://docs.python.org/3", None),
     "django": (
         "https://docs.djangoproject.com/en/stable/",
         "https://docs.djangoproject.com/en/stable/_objects/",

docs/requirements.txt

@@ -1,7 +1,7 @@
 # Packages required only for building docs
 
-Pygments~=2.16.1
+Pygments~=2.18.0
 readme-renderer~=41.0
-sphinx~=7.2
+sphinx~=7.4
 sphinx-rtd-theme~=2.0.0
 sphinxcontrib-googleanalytics~=0.4