chore(deps): bump urllib3 from 1.26.12 to 1.26.19 in /docs

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.12 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@1.26.12...1.26.19)

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

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

Author: dependabot[bot]

docs/requirements.txt

@@ -27,6 +27,6 @@ pyyaml_env_tag==0.1
 requests==2.28.1
 six==1.16.0
 tinycss2==1.2.1
-urllib3==1.26.12
+urllib3==1.26.19
 watchdog==2.1.9
 webencodings==0.5.1