Bump urllib3 from 1.26.7 to 1.26.18 (#38)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.7 to 1.26.18.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/1.26.7...1.26.18)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -61,7 +61,7 @@ sortedcontainers==2.4.0
 tornado==6.1
 transformations==2021.6.6
 typing-extensions==4.0.1
-urllib3==1.26.7
+urllib3==1.26.18
 urwid==2.1.2
 wcwidth==0.2.5
 Werkzeug==2.0.2