Sreenithi Sridharan ce9f0496e7 [Fix][Python] Pin pip version to 25.2 in Python tests (#40959) ...

Pip released [v25.3](https://pip.pypa.io/en/stable/news/#v25-3) a few days back which doesn't support `setup.py` builds anymore, while we are yet to migrate to use the `pyproject.toml` build system in #40833.

Hence some of our Python tests using the most recent versions of pip for the build have started to fail with errors like:
```
  ERROR: Failed building wheel for grpcio
Failed to build grpcio
error: failed-wheel-build-for-install

× Failed to build installable wheels for some pyproject.toml based projects
```

This PR hence pins the pip version to 25.2 which still supports setup.py build until #40833 is submitted.

Closes #40959

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/40959 from sreenithi:pin_pip_version d72e0563ce0f00a962bd03ddd279cf587494fd3e
PiperOrigin-RevId: 824584176

2025-10-27 10:46:00 -07:00

..

bazel

[CI] Use python 3.9+ everywhere (#40139)

2025-07-24 11:31:19 -07:00

cpp

[CI] CI fixes (#39251)

2025-04-15 07:21:35 -07:00

csharp

[csharp] Use a stable/supported C# runtime in ubuntu 22.04 distribtest docker images (#35955)

2024-02-27 10:34:33 -08:00

gcf/python

Removed no-gen2 flag to allow support for Python313 runtime (#39327)

2025-04-22 10:10:22 -07:00

php

[test] Run PHP distribtests with make -j8 (#33831)

2023-07-24 11:38:50 -07:00

python

[Fix][Python] Pin pip version to 25.2 in Python tests (#40959)

2025-10-27 10:46:00 -07:00

ruby

[Ruby] add ruby distrib test with protobuf 3.25 (#37169)

2024-07-10 21:50:42 -07:00