Bump urllib3 from 1.26.19 to 2.5.0 in /__tests__/data and document breaking changes in v6 (#1139)

* Bump urllib3 from 1.26.19 to 2.5.0 in /__tests__/data

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.19 to 2.5.0.
- [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/1.26.19...2.5.0)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 2.5.0
  dependency-type: direct:production
...

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

* documentation update

* doc update

* doc update

* doc format update

* doc update

* doc update

* doc update

* fix check failures

---------

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

README.md

@@ -11,6 +11,13 @@ This action provides the following functionality for GitHub Actions users:
 - Optionally caching dependencies for pip, pipenv and poetry
 - Registering problem matchers for error output
 
+## Breaking changes in V6
+
+- Upgraded action from node20 to node24
+  > Make sure your runner is on version v2.327.1 or later to ensure compatibility with this release. See [Release Notes](https://github.com/actions/runner/releases/tag/v2.327.1)
+
+For more details,  see the full release notes on the [releases page](https://github.com/actions/setup-python/releases/tag/v6.0.0)
+
 ## Basic usage
 
 See [action.yml](action.yml)