Update dev image.

[claudevdm]

Please add a meaningful description for your change here

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[gemini-code-assist]

Summary of Changes

Hello @claudevdm, 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 focuses on updating the development SDK container image tag. This is a routine maintenance task to ensure that the development environment uses the latest compatible container image, reflecting any recent changes in the SDK harness or its launcher components.

Highlights

• Development SDK Container Tag Update: The BEAM_DEV_SDK_CONTAINER_TAG has been updated from beam-master-20251006 to beam-master-20251020. This update is typically required when there are changes to the SDK harness container or SDK harness launcher.

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[claudevdm]

R: @liferoad

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