chore: add missing imports to Office type tests

[vagenas]

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[mergify]

Merge Protections

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🟢 Enforce conventional commit

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Make sure that we follow https://www.conventionalcommits.org/en/v1.0.0/

• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?(!)?:

[vagenas]

For reference, issue was not auto-detected because flake8 is currently not activated on docling pre-commit hooks.