Refresh mkdocs dependencies

Author: mdmintz

mkdocs_build/requirements.txt

@@ -11,7 +11,7 @@ pipdeptree>=2.12.0
 bleach>=6.0.0
 docutils>=0.20.1
 python-dateutil>=2.8.2
-tqdm>=4.66.0
+tqdm>=4.66.1
 nltk>=3.8.1
 joblib>=1.3.2
 livereload==2.6.3
@@ -21,7 +21,7 @@ Jinja2==3.1.2
 click==8.1.6
 ghp-import==2.1.0
 lunr==0.6.2
-tornado==6.3.2
+tornado==6.3.3
 watchdog==3.0.0
 cairocffi==1.6.1
 cairosvg==2.7.1