Bump urllib3 from 1.26.12 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.12 to 1.26.18.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.12...1.26.18)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -35,5 +35,5 @@ sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
 tornado==6.3.3
 typing_extensions==4.5.0
-urllib3==1.26.12
+urllib3==1.26.18
 zipp==3.10.0