docs: update CHANGES.md with BigQueryIO bugfix

[liferoad]

Add entry for BigQueryIO temporary dataset project fix (#35813)

See #35817 (review)

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[gemini-code-assist]

Summary of Changes

Hello @liferoad, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the CHANGES.md file to document a significant bug fix for BigQueryIO in Python. The fix addresses an issue where temporary datasets were being created in the wrong Google Cloud project when a different project was specified for the temporary dataset than the pipeline's main project. This update ensures that users are aware of this important resolution, improving clarity and transparency regarding recent changes to the project.

Highlights

• Documentation Update: I've added an entry to CHANGES.md to record a recent bug fix.
• BigQueryIO Bugfix: The documented fix resolves an issue in BigQueryIO (Python) where temporary datasets were incorrectly created in the pipeline's project instead of the specified temp_dataset project.

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