Bump urllib3 from 1.7.1 to 1.24.2

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.7.1 to 1.24.2.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/master/CHANGES.rst)
- [Commits](urllib3/urllib3@1.7.1...1.24.2)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -100,7 +100,7 @@ six==1.10.0
 system-service==0.1.6
 tzlocal==1.2
 uTidylib==0.2
-urllib3==1.7.1
+urllib3==1.24.2
 vboxapi==1.0
 vim-debug==1.5.4
 virtualenv==1.11.4