Bump urllib3 from 2.6.2 to 2.6.3 (#6465)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.6.2 to 2.6.3.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/2.6.2...2.6.3)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements_tests.txt

@@ -13,4 +13,4 @@ time-machine==3.2.0
 types-docker==7.1.0.20251202
 types-pyyaml==6.0.12.20250915
 types-requests==2.32.4.20250913
-urllib3==2.6.2
+urllib3==2.6.3