[Security] Bump urllib3 from 1.24.1 to 1.24.2

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.24.1 to 1.24.2. **This update includes security fixes.**
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/master/CHANGES.rst)
- [Commits](urllib3/urllib3@1.24.1...1.24.2)

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

requirements.txt

@@ -9,7 +9,7 @@ amqp==2.4.2
 pyyaml>=4.2b1
 beautifulsoup4==4.7.1
 httplib2<=0.10.3
-urllib3==1.24.1
+urllib3==1.24.2
 Paver==1.3.4
 python-slugify==3.0.1
 django-floppyforms<=1.7.0