Bump lxml from 4.4.2 to 4.5.0

Bumps [lxml](https://github.com/lxml/lxml) from 4.4.2 to 4.5.0.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.4.2...lxml-4.5.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

requirements.txt

@@ -1,5 +1,5 @@
 tornado==5.0.2 # Because https://stackoverflow.com/questions/55452074/bokeh-serve-show-myapp
-lxml==4.4.2
+lxml==4.5.0
 python-dotenv==0.12.0
 redis==3.3.11
 schedule==0.6.0