Bump urllib3 from 1.26.5 to 1.26.18 in /tools/PccsAdminTool

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.5 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@1.26.5...1.26.18)

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

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

Author: dependabot[bot]

tools/PccsAdminTool/requirements.txt

@@ -5,4 +5,4 @@ pyOpenSSL==23.2.0
 pypac==0.14.0
 Requests==2.31.0
 setuptools==65.5.1
-urllib3==1.26.5
+urllib3==1.26.18