Bump urllib3 from 1.26.8 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.8 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@1.26.8...1.26.18)

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

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

requirements.txt

@@ -108,7 +108,7 @@ typing_extensions==4.0.1
 tzdata==2021.5
 tzlocal==4.1
 uritemplate==4.1.1
-urllib3==1.26.8
+urllib3==1.26.18
 vine==5.0.0
 wcwidth==0.2.5
 wrapt==1.13.3