Bump urllib3 from 1.24.1 to 1.26.5

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.24.1 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/1.24.1...1.26.5)

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

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

requirements.txt

@@ -25,4 +25,4 @@ scipy==1.2.0
 six==1.12.0
 smart-open==1.7.1
 subprocess32==3.5.3
-urllib3==1.24.1
+urllib3==1.26.5