Bump urllib3 in /src/docs in the pip group across 1 directory

Bumps the pip group with 1 update in the /src/docs directory: [urllib3](https://github.com/urllib3/urllib3).


Updates `urllib3` from 1.25.8 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@1.25.8...1.26.19)

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

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

src/docs/requirements.txt

@@ -85,7 +85,7 @@ tomli==2.0.1
 Twisted==18.9.0
 ubuntu-pro-client==8001
 ufw==0.36
-urllib3==1.25.8
+urllib3==1.26.19
 userpath==1.9.2
 wadllib==1.3.3
 WALinuxAgent==2.2.46