update python container tag to 03-09

[derrickaw]

Please add a meaningful description for your change here

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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 performs a routine update of the Python SDK development container tag. This ensures that the Dataflow runner uses the latest specified Beam master container image for development purposes, aligning with recent builds or changes in the SDK harness.

Highlights

• Python SDK Container Tag Update: The BEAM_DEV_SDK_CONTAINER_TAG in sdks/python/apache_beam/runners/dataflow/internal/names.py was updated from beam-master-20260220 to beam-master-20260309.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.87%. Comparing base (d6759cf) to head (16945ce).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #37812   +/-   ##
=========================================
  Coverage     56.87%   56.87%           
  Complexity     3416     3416           
=========================================
  Files          1178     1178           
  Lines        187501   187555   +54     
  Branches       3590     3590           
=========================================
+ Hits         106635   106681   +46     
- Misses        77472    77480    +8     
  Partials       3394     3394           

Flag	Coverage Δ
python	80.08% <100.00%> (+<0.01%)	⬆️

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[derrickaw]

Run Python_Runners PreCommit 3.12

[derrickaw]

Run Portable_Python PreCommit 3.10

[derrickaw]

Run Python PreCommit 3.11

[derrickaw]

Failures don't seem related, but retries won't initiate.

[derrickaw]

assign set of reviewers

[github-actions]

Assigning reviewers:

R: @jrmccluskey for label python.

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[derrickaw]

Run Portable_Python PreCommit 3.10

[derrickaw]

Run Python PreCommit 3.11

[derrickaw]

Run Python PreCommit 3.13

[derrickaw]

Run Python_Integration PreCommit 3.10

[derrickaw]

Run Python_Integration PreCommit 3.13

[derrickaw]

Run Portable_Python PreCommit 3.10

[derrickaw]

Run Portable_Python PreCommit 3.10

[derrickaw]

Run PythonDocker PreCommit 3.10

[derrickaw]

Run PythonDocker PreCommit 3.12

[derrickaw]

Run PythonDocker PreCommit 3.11

[derrickaw]

Hi @jrmccluskey, finally got the failing checks passed that I can retry on. The last two are due to that 429 error. Thanks