Updates Beam master container tags for Dataflow

[chamikaramj]

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Summary of Changes

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This pull request updates the master container tags used by the Google Cloud Dataflow runner in the Apache Beam project to ensure the environment uses the latest available images.

Highlights

• Container Version Update: Updated the Dataflow legacy and FnAPI container versions from 'beam-master-20260513' to 'beam-master-20260601'.

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Code Review

This pull request updates the dataflowLegacyContainerVersion and dataflowFnapiContainerVersion to beam-master-20260601 in the Google Cloud Dataflow runner build configuration. There are no review comments, and I have no additional feedback to provide.

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