Bump urllib3 from 1.25.9 to 1.26.19

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.9 to 1.26.19.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.25.9...1.26.19)

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

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

Author: dependabot[bot]

requirements.txt

@@ -34,5 +34,5 @@ threadpoolctl==2.1.0
 toolz==0.10.0
 tornado==6.0.4
 typing-extensions==3.7.4.2
-urllib3==1.25.9
+urllib3==1.26.19
 zict==2.0.0