Bump urllib3 from 1.26.18 to 1.26.19

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.18 to 1.26.19.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/1.26.19/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.18...1.26.19)

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

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

requirements.txt

@@ -60,7 +60,7 @@ sphinxcontrib-websupport==1.2.0
 toolz==0.10.0
 tqdm==4.43.0
 twine==3.1.1
-urllib3==1.26.18
+urllib3==1.26.19
 wcwidth==0.1.8
 webencodings==0.5.1
 zipp==3.0.0