Bump urllib3 in /Solutions/CiscoUmbrella/Data Connectors

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.11 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@1.25.11...1.26.18)

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

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

Solutions/CiscoUmbrella/Data Connectors/requirements.txt

@@ -24,4 +24,4 @@ requests-oauthlib==1.3.1
 s3transfer==0.2.1
 six==1.16.0
 typing_extensions==4.0.0
-urllib3==1.25.11
+urllib3==1.26.18