pythonGH-117928: Bump the minimum Sphinx version to 6.2.1 (pythonGH-121986)

(cherry picked from commit 7dd52b6)

Co-authored-by: Adam Turner <[email protected]>

Author: AA-Turner

Doc/conf.py

@@ -83,7 +83,7 @@
 highlight_language = 'python3'
 
 # Minimum version of sphinx required
-needs_sphinx = '4.2'
+needs_sphinx = '6.2.1'
 
 # Create table of contents entries for domain objects (e.g. functions, classes,
 # attributes, etc.). Default is True.