Update BEAM_DEV_SDK_CONTAINER_TAG version

[damccorm]

Updating to new container versions

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[gemini-code-assist]

Summary of Changes

Hello, 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 development SDK container tag used by the Dataflow runner. This change ensures that the environment is aligned with the most recent updates to the SDK harness container and launcher.

Highlights

• Container Tag Update: Updated the BEAM_DEV_SDK_CONTAINER_TAG to 'beam-master-20260615' to ensure the use of the latest SDK harness container images.

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Code Review

This pull request updates the BEAM_DEV_SDK_CONTAINER_TAG constant in names.py to 'beam-master-20260615'. There are no review comments, and I have no feedback to provide.

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[damccorm]

assign set of reviewers

[github-actions]

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R: @claudevdm for label python.

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