Issue #, if available: Related to aws/aws-durable-execution-sdk-python-testing#{{PR_NUMBER}}
Description of changes: Testing changes from testing SDK branch {{BRANCH_NAME}} using locked dependencies in uv.lock
This PR locks the testing SDK to a specific commit from branch {{BRANCH_NAME}} using uv.lock for reproducible builds.
PYTHON_LANGUAGE_SDK_BRANCH: main PYTHON_TESTING_SDK_BRANCH: {{BRANCH_NAME}}
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