Bump urllib3 from 1.26.9 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.9 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@1.26.9...1.26.18)

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

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

Author: dependabot[bot]

requirements-notebook.txt

@@ -79,7 +79,7 @@ terminado==0.13.3
 testpath==0.6.0
 tornado==6.3.3
 traitlets==5.1.1
-urllib3==1.26.9
+urllib3==1.26.18
 wcwidth==0.2.5
 webencodings==0.5.1
 websocket-client==1.3.1