Bump urllib3 from 1.7.1 to 1.26.5

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.7.1 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@1.7.1...1.26.5)

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

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

requirements.txt

@@ -27,6 +27,6 @@ backports.ssl-match-hostname==3.4.0.2
 docopt==0.6.2
 beautifulsoup4==4.2.1
 lxml==3.4.0
-urllib3==1.7.1
+urllib3==1.26.5
 raven==5.32.0
 bcrypt==3.1.4