Bump urllib3 from 1.26.17 to 1.26.18 in /etc/generic (#3191)

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
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

etc/generic/requirements-elyra.txt

@@ -16,7 +16,7 @@ prompt-toolkit==3.0.30
 requests==2.31.0
 tornado==6.3.3
 traitlets==5.1.1
-urllib3==1.26.17
+urllib3==1.26.18
 #
 # These excluded are transitive dependencies of the included python packages.
 #ansiwrap==0.8.4