Merge pull request #163 from oceanhackweek/dependabot/pip/lxml-4.9.1

Author: dependabot[bot]

requirements.txt

@@ -53,7 +53,7 @@ jupyter-server-mathjax==0.2.3
 jupyter-sphinx==0.3.2
 jupyterlab-widgets==1.0.0
 livereload==2.6.3
-lxml==4.8.0
+lxml==4.9.1
 markdown-it-py==1.1.0
 MarkupSafe==2.1.1
 matplotlib-inline==0.1.2