Bump urllib3 from 1.25.9 to 1.26.17

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.9 to 1.26.17.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.25.9...1.26.17)

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

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

requirements.txt

@@ -109,7 +109,7 @@ toml==0.10.1
 tornado==6.0.4
 traitlets==4.3.3
 typed-ast==1.4.1
-urllib3==1.25.9
+urllib3==1.26.17
 wcwidth==0.2.4
 webencodings==0.5.1
 Werkzeug==1.0.1