Bump sphinx from 7.4.7 to 8.0.2 in /docs/readthedocs (#1126)

Author: dependabot[bot]

docs/readthedocs/requirements.txt

@@ -1,6 +1,6 @@
 commonmark==0.9.1
 recommonmark==0.7.1
-Sphinx==7.4.7
+Sphinx==8.0.2
 sphinx-rtd-theme==3.0.0
 myst-parser==4.0.0
 markdown-it-py==3.0.0