Bump urllib3 from 1.26.6 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.6 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@1.26.6...1.26.18)

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

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

requirements.txt

@@ -15,4 +15,4 @@ pytimeparse==1.1.8
 PyYAML==6.0.1
 requests==2.31.0
 StringGenerator==0.4.4
-urllib3==1.26.6
+urllib3==1.26.18