Update docs dependencies

Author: mdmintz

docs/requirements.txt

@@ -6,12 +6,12 @@ Markdown==3.3.4
 docutils==0.17.1
 Jinja2==2.11.3
 readme-renderer==29.0
-pymdown-extensions==8.1.1
+pymdown-extensions==8.2
 importlib-metadata==4.0.1;python_version>="3.6"
 lunr==0.5.8
 nltk==3.6.2
 mkdocs==1.1.2
-mkdocs-material==7.1.3
+mkdocs-material==7.1.4
 mkdocs-exclude-search==0.5.2;python_version>="3.6"
 mkdocs-simple-hooks==0.1.3
 mkdocs-material-extensions==1.0.1