Bump urllib3 from 1.25.8 to 1.26.5

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.8 to 1.26.5.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.25.8...1.26.5)

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

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

Author: dependabot[bot]

requirements.txt

@@ -20,6 +20,6 @@ pyopenssl==19.1.0
 pytz==2019.3
 requests[security]==2.23.0
 six==1.14.0
-urllib3==1.25.8
+urllib3==1.26.5
 watchdog==0.10.2
 werkzeug==0.16.1