Bump urllib3 from 1.26.17 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.17 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@1.26.17...1.26.18)

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

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

requirements_frozen.txt

@@ -76,6 +76,6 @@ tqdm==4.66.1
 typing_extensions==4.8.0
 tzdata==2023.3
 uritemplate==4.1.1
-urllib3==1.26.17
+urllib3==1.26.18
 webdavclient3==3.14.6
 zipp==3.17.0