Bump urllib3 from 2.5.0 to 2.6.0 in /sdks/python/container/py312

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@2.5.0...2.6.0)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 2.6.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

sdks/python/container/py312/base_image_requirements.txt

@@ -176,7 +176,7 @@ typing_extensions==4.15.0
 tzdata==2025.2
 ujson==5.11.0
 uritemplate==4.2.0
-urllib3==2.5.0
+urllib3==2.6.0
 virtualenv-clone==0.5.7
 websockets==15.0.1
 wheel==0.45.1