build(deps): bump urllib3 from 1.23 to 1.24.2 in /ci (#106)

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]

ci/requirements.txt

@@ -1,5 +1,5 @@
 PyGithub==1.43.2
-urllib3==1.23
+urllib3==1.24.2
 chardet==3.0.4
 idna==2.7
 wrapt==1.10.11