Bump sphinx from 8.1.3 to 8.2.0 in /docs/readthedocs (#253)

docs/readthedocs/requirements.txt

@@ -1,6 +1,6 @@
 commonmark==0.9.1
 recommonmark==0.7.1
-Sphinx==8.1.3
+Sphinx==8.2.0
 sphinx-rtd-theme==3.0.2
 myst-parser==4.0.0
 markdown-it-py==3.0.0