Update requirements for "Read the Docs"

Cito · Cito · commit 8832f5dd7c02 · 2021-12-04T20:33:54.000+01:00
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -1,2 +1,2 @@
-sphinx>=3.5,<4
+sphinx>=4.2,<5
 sphinx_rtd_theme>=0.5,<1
