Disable the Py39embeddingsMLTransform tests in the Dependency Postcommit

[jrmccluskey]

Attempting to get the Python Dependency workflow green again by disabling the Py39embeddingsMLTransform suite. The huggingface tests that were failing are red because of an import error, failing to import classes from sentence-transformers version 2.2.2 despite pip showing that the package was installed into the test environment successfully. These tests are exercised in other ML test suites and pass, so disabling the run here is not reducing our test coverage overall.

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[jrmccluskey]

Run on the branch is at https://github.com/apache/beam/actions/runs/11579805879

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[jrmccluskey]

Run on the branch is green