Update py container tag

[ahmedabu98]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @ahmedabu98, 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 container tag for the Apache Beam Python SDK. By bumping the version of the BEAM_DEV_SDK_CONTAINER_TAG, it ensures that any Dataflow jobs leveraging the Python SDK will utilize the most current container image, incorporating recent developments and fixes from the Beam master branch.

Highlights

• Python SDK Container Tag Update: The BEAM_DEV_SDK_CONTAINER_TAG in names.py has been updated from beam-master-20251210 to beam-master-20251218. This change ensures that the Python SDK harness container used for development reflects the latest specified version from the Beam master branch.

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[ahmedabu98]

assign set of reviewers

[github-actions]

Assigning reviewers:

R: @damccorm for label python.

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[damccorm]

Thanks!