ansible-test - Update pinned pip to 25.2 (#85982)

(cherry picked from commit de7dd5bbb2)

changelogs/fragments/ansible-test-sanity-requirements-again.yml

@@ -3,3 +3,4 @@ minor_changes:
   - ansible-test - Filter out pylint messages for invalid filenames and display a notice when doing so.
   - ansible-test - Update astroid imports in custom pylint checkers.
   - ansible-test - Default to Python 3.14 in the ``base`` and ``default`` test containers.
+  - ansible-test - Update pinned ``pip`` version to 25.2.

test/lib/ansible_test/_internal/python_requirements.py

@@ -433,7 +433,7 @@ def get_venv_packages(python: PythonConfig) -> dict[str, str]:
     #       See: https://github.com/ansible/base-test-container/blob/main/files/installer.py
 
     default_packages = dict(
-        pip='24.2',
+        pip='25.2',
     )
 
     override_packages: dict[str, dict[str, str]] = {