Update Python container tag

[ahmedabu98]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request updates the default container image tag for unreleased Python SDKs within Apache Beam's Dataflow runner. This ensures that development versions of the SDK are built and run with the most current and compatible SDK harness container, reflecting recent internal changes.

Highlights

• Python Container Tag Update: The BEAM_DEV_SDK_CONTAINER_TAG in sdks/python/apache_beam/runners/dataflow/internal/names.py has been updated from beam-master-20251020 to beam-master-20251113. This tag is used for unreleased SDKs and is updated to reflect changes requiring updates to the SDK harness container or launcher.

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[github-actions]

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R: @damccorm for label python.

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