pin sphinx (#1287)

skarimo · web-flow · commit 7f3b93e4c0d5 · 2023-01-05T13:50:05.000-05:00
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -1,4 +1,4 @@
-Sphinx
+Sphinx==6.0.0
 sphinx_material
 m2r2
 docutils<0.19
