[3.2.x] Bumped minimum Sphinx version to 4.5.0.

Related Sphinx changes:
- https://github.com/sphinx-doc/sphinx/pull/8898
- https://github.com/sphinx-doc/sphinx/issues/8326

Backport of ebf25555bbed3e9112d4b726575d60b242daf48a from main.

docs/conf.py

@@ -32,7 +32,7 @@ sys.path.append(abspath(join(dirname(__file__), "_ext")))
 # -- General configuration -----------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
-needs_sphinx = '1.6.0'
+needs_sphinx = "4.5.0"
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
@@ -70,8 +70,8 @@ source_suffix = '.txt'
 # The encoding of source files.
 # source_encoding = 'utf-8-sig'
 
-# The master toctree document.
-master_doc = 'contents'
+# The root toctree document.
+root_doc = "contents"
 
 # General substitutions.
 project = 'Django'
@@ -102,12 +102,12 @@ else:
 django_next_version = '4.0'
 
 extlinks = {
-    'bpo': ('https://bugs.python.org/issue%s', 'bpo-'),
-    'commit': ('https://github.com/django/django/commit/%s', ''),
-    'cve': ('https://nvd.nist.gov/vuln/detail/CVE-%s', 'CVE-'),
+    "bpo": ("https://bugs.python.org/issue?@action=redirect&bpo=%s", "bpo-%s"),
+    "commit": ("https://github.com/django/django/commit/%s", "%s"),
+    "cve": ("https://nvd.nist.gov/vuln/detail/CVE-%s", "CVE-%s"),
     # A file or directory. GitHub redirects from blob to tree if needed.
-    'source': ('https://github.com/django/django/blob/main/%s', ''),
-    'ticket': ('https://code.djangoproject.com/ticket/%s', '#'),
+    "source": ("https://github.com/django/django/blob/main/%s", "%s"),
+    "ticket": ("https://code.djangoproject.com/ticket/%s", "#%s"),
 }
 
 # The language for content autogenerated by Sphinx. Refer to documentation
@@ -304,7 +304,7 @@ man_pages = [(
 # List of tuples (startdocname, targetname, title, author, dir_entry,
 # description, category, toctree_only)
 texinfo_documents = [(
-    master_doc, "django", "", "", "Django",
+    root_doc, "django", "", "", "Django",
     "Documentation of the Django framework", "Web development", False
 )]