Bump urllib3 from 1.22 to 1.24.2 in /_site/tools/req

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.22 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@1.22...1.24.2)

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

Author: dependabot[bot]

_site/tools/req/requirements.txt

@@ -9,4 +9,4 @@ idna==2.6
 PyYAML>=3.13
 requests>=2.22
 smmap2==2.0.3
-urllib3==1.22
+urllib3==1.24.2