Bump urllib3 from 1.26.7 to 1.26.18 in /scripts

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](urllib3/urllib3@1.26.7...1.26.18)

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

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

Author: dependabot[bot]

scripts/requirements.txt

@@ -26,4 +26,4 @@ rsa==4.7.2
 six==1.16.0
 tqdm==4.62.3
 uritemplate==4.1.1
-urllib3==1.26.7
+urllib3==1.26.18