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>

__tests__/data/requirements-linux.txt

@@ -8,5 +8,5 @@ packaging==20.7
 pdf2image==1.12.1
 Pygments==2.6.1
 requests==2.32.2
-urllib3==1.26.19
+urllib3==2.5.0
 xlrd==1.2.0

__tests__/data/requirements.txt

@@ -42,6 +42,6 @@ pywin32-ctypes==0.2.0
 
 requests==2.32.2
 
-urllib3==1.26.19
+urllib3==2.5.0
 
 xlrd==1.2.0