[Website] Update Python version compatibility table

[jrmccluskey]

The Python language version compatibility table was out of date, this fixes the issue.

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[gemini-code-assist]

Summary of Changes

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This pull request updates the Python version compatibility table in the documentation to ensure users have accurate information regarding supported Python versions and their corresponding Apache Beam releases.

Highlights

• Python Version Support: Added support for Python 3.14, noting compatibility with Beam versions 2.73.0 and later.
• Compatibility Range Update: Updated the support range for Python 3.9 to reflect compatibility between Beam versions 2.37.0 and 2.69.0.

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Code Review

This pull request updates the Python SDK documentation to add support details for Python 3.14 (supported in Beam versions >= 2.73.0) and restricts the supported Beam versions for Python 3.9 to a range ending at 2.69.0. Feedback was provided to simplify the version range expression for Python 3.9 by removing the redundant "greater than or equal to" symbol to improve clarity.

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R: @shunping for label website.

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