release: Update package.xml version to 4.0.4

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passed format #126476

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passed robotpkg-py-dynamic-graph-v3-18.04 #126467

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passed robotpkg-py-dynamic-graph-v3-20.04 #126468

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passed robotpkg-py-dynamic-graph-v3-buster #126470

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passed robotpkg-py-dynamic-graph-v3-ferrum #126471

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passed robotpkg-py-dynamic-graph-v3-stretch #126473

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