chore: bump urllib3 from 1.26.12 to 1.26.13 in /tests

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.12 to 1.26.13.
- [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/1.26.12...1.26.13)

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

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

tests/requirements_py3.txt

@@ -26,4 +26,4 @@ requests==2.28.1
 six==1.16.0
 toml==0.10.2
 ubi-reader==0.8.2
-urllib3==1.26.12
+urllib3==1.26.13