docs: Update supported Python versions in CONTRIBUTING.md to 3.10-3.13

[vkarampudi]

Description

This PR resolves Issue #7774 by updating the outdated Python version support statement in CONTRIBUTING.md.

The Problem

The CONTRIBUTING.md file currently states:

“At this point, TFX only supports Python 3 (3.7, 3.8, and 3.9) on Linux and MacOS.”

This documentation is significantly outdated. In our current configuration (defined in pyproject.toml), TFX has transitioned to requiring Python >= 3.10, with official support extending up to Python 3.13. Python 3.7, 3.8, and 3.9 are no longer supported.

The Solution

We updated CONTRIBUTING.md to accurately reflect the active Python version support matrix:

“At this point, TFX only supports Python 3 (3.10, 3.11, 3.12, and 3.13) on Linux and MacOS.”

This aligns the documentation perfectly with the project's build and package configuration.

[rwitcher]

LGTM