Bump urllib3 from 1.26.18 to 1.26.19 (#586)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Pipfile

@@ -57,7 +57,7 @@ static3 = "~=0.7.0"
 svg2rlg = "~=0.3"
 tini = "~=3.0.1"
 tornado = "~=6.3"
-urllib3 = "~=1.26.18"
+urllib3 = "~=1.26.19"
 whitenoise = "~=5.2.0"
 yolk = "~=0.4.3"
 zipp = "~=3.4.0"