Bump urllib3 from 1.25.8 to 1.25.9 in /docs/tools

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.8 to 1.25.9.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/master/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/1.25.8...1.25.9)
Signed-off-by: Ndependabot-preview[bot] <support@dependabot.com>

docs/tools/requirements.txt

@@ -35,4 +35,4 @@ soupsieve==2.0
 termcolor==1.1.0
 tornado==5.1.1
 Unidecode==1.1.1
-urllib3==1.25.8
+urllib3==1.25.9

docs/tools/translate/requirements.txt

@@ -9,4 +9,4 @@ python-slugify==4.0.0
 PyYAML==5.3.1
 requests==2.23.0
 text-unidecode==1.3
-urllib3==1.25.8
+urllib3==1.25.9