Bump urllib3 from 1.10.4 to 1.26.5

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.10.4 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/1.10.4...1.26.5)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/requirements.txt b/requirements.txt
index 3a89de4..cc76c4b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,5 +25,5 @@
 simplejson==3.8.2
 six==1.10.0
 Twisted==16.1.1
-urllib3==1.10.4
+urllib3==1.26.5
 zope.interface==4.1.3