Update sphinx from 3.5.4 to 4.2.0 in documentation requirements

diff --git a/docs/requirements.txt b/docs/requirements.txt
index d830e6386b19c63090341e183c21c49851707074..c1935e0ac364bad13ede6dcd27738ad00e05845c 100644 (file)
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,4 @@
 myst-parser==0.15.2
-sphinx==3.5.4
+sphinx==4.2.0
 sphinx-hoverxref==0.7b1
 sphinx_rtd_theme==1.0.0