Update pip requirement in /python/helpers

Updates the requirements on [pip](https://github.com/pypa/pip) to permit the latest version.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@21.3.1...23.2)

---
updated-dependencies:
- dependency-name: pip
  dependency-type: direct:production
...

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

python/helpers/requirements.txt

@@ -1,4 +1,4 @@
-pip>=21.3.1,<23.2.0  # Range maintains py36 support TODO: Review python 3.6 support in April 2023 (eol ubuntu 18.04)
+pip>=21.3.1,<23.3.0  # Range maintains py36 support TODO: Review python 3.6 support in April 2023 (eol ubuntu 18.04)
 pip-tools>=6.4.0,<=6.14.0  # Range maintains py36 support TODO: Review python 3.6 support in April 2023 (eol ubuntu 18.04)
 hashin==0.17.0
 pipenv==2022.4.8