chore: remove unused direct dependency

[tarilabs]

Description

There is no reference to this direct dependency, beside the comment which might be superseeded by newer pydantic versions which we bumped in the meantime

How Has This Been Tested?

raising this PR in draft so to execute suite in entirety

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[google-oss-prow]

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[tarilabs]

resolving this PR as the dependency is still needed by the code-generated, annotated #1911 (review)