Bump urllib3 from 1.25.2 to 1.26.5

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.2 to 1.26.5.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/1.25.2...1.26.5)

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

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

requirements.txt

@@ -3,7 +3,7 @@ Werkzeug>=1.0.1
 wheel==0.33.6
 gunicorn==20.1.0
 requests==2.24.0
-urllib3==1.25.2
+urllib3==1.26.5
 flask==2.0.3
 flask-session==0.3.2
 flask-helper==0.19