Restrict Sphinx version used for Read the Docs

Cito · Cito · commit 1d8513ac659d · 2022-09-25T19:16:58.000+02:00
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -1,2 +1,2 @@
-sphinx>=4.3,<6
+sphinx>=5.1,<5.2
 sphinx_rtd_theme>=1,<2
