try including upgrade flag

FoamyGuy · FoamyGuy · commit cbcd76e85fd0 · 2023-01-09T15:02:56.000-06:00
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -3,4 +3,4 @@
 # SPDX-License-Identifier: Unlicense
 
 sphinx>=4.0.0
-sphinx-rtd-theme
+sphinx-rtd-theme --install-option="--upgrade"
