Bump urllib3 from 1.23 to 1.26.5

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.23 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@1.23...1.26.5)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -11,7 +11,7 @@ Jinja2==2.10
 MarkupSafe==1.1.1
 pyasn1==0.4.3
 requests==2.19.1
-urllib3==1.23
+urllib3==1.26.5
 Werkzeug==0.14.1
 zope.event==4.5.0
 zope.interface==5.4.0