Bump urllib3 from 2.5.0 to 2.6.3 in /etc

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.5.0 to 2.6.3.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@2.5.0...2.6.3)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 2.6.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

etc/requirements.txt

@@ -69,6 +69,6 @@ tomlkit==0.11.6
 typing-inspect==0.7.1
 typing_extensions==4.0.1
 uritemplate==4.1.1
-urllib3==2.5.0
+urllib3==2.6.3
 wrapt==1.14.1
 zipp==3.20.2