Merge pull request #1394 from kyegomez/dependabot/pip/pymdown-extensions-approx-eq-10.21

Update pymdown-extensions requirement from ~=10.20 to ~=10.21

Author: kyegomez

docs/requirements.txt

@@ -27,7 +27,7 @@ jinja2~=3.1
 markdown~=3.10
 mkdocs-material-extensions~=1.3
 pygments~=2.19
-pymdown-extensions~=10.20
+pymdown-extensions~=10.21
 
 # Requirements for plugins
 colorama~=0.4