Bump urllib3 from 1.23 to 1.24.2 in /Mini Search

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.23 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@1.23...1.24.2)

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

Author: dependabot[bot]

Mini Search/requirements.txt

@@ -13,6 +13,6 @@ lxml==4.2.1
 MarkupSafe==1.0
 requests==2.20.0
 six==1.11.0
-urllib3==1.23
+urllib3==1.24.2
 webencodings==0.5.1
 Werkzeug==0.15.3