Update openstackdocstheme to the latest version

zhongshengping · zhongshengping · commit 3566cda8a1b0 · 2021-09-29T16:06:50.000+08:00
Change-Id: Idf934bdc8d831b645cfae09610343b6ba8be5ae7
diff --git a/doc/requirements.txt b/doc/requirements.txt
@@ -1,6 +1,6 @@
 # This is required for the docs build jobs
 sphinx>=3.5.1 # BSD
-openstackdocstheme>=2.2.1 # Apache-2.0
+openstackdocstheme>=2.2.7 # Apache-2.0
 
 # This is required for the releasenotes build jobs
 reno>=3.2.0 # Apache-2.0
