Bump urllib3 from 1.26.7 to 1.26.19

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.7 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@1.26.7...1.26.19)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: indirect
...

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

requirements.txt

@@ -8,16 +8,12 @@ alabaster==0.7.12
     # via sphinx
 babel==2.9.1
     # via sphinx
-backports.entry-points-selectable==1.1.0
+backports-entry-points-selectable==1.1.0
     # via virtualenv
 certifi==2021.10.8
     # via requests
 charset-normalizer==2.0.7
     # via requests
-colorama==0.4.4
-    # via
-    #   sphinx
-    #   tox
 commonmark==0.9.1
     # via recommonmark
 distlib==0.3.3
@@ -88,7 +84,7 @@ toml==0.10.2
     # via tox
 tox==3.24.4
     # via -r requirements.in
-urllib3==1.26.7
+urllib3==1.26.19
     # via requests
 virtualenv==20.8.1
     # via tox