fix: remove extra space before and after group items

[ceberam]

This PR is intended to align the ground truth files of exported DoclingDocument objects with the refactoring of serializers in docling-core from PR docling-project/docling-core#605, to fix the issue docling-project/docling-core#371

We should proceed with the following sequential steps:

• Review and approve the PR fix: (cont.) Remove Extra Space Before and After Group Items using Inline Boundaries docling-core#605
• Make a new release of docling-core
• Update the pyproject.toml and uv.lock of this PR to pin the new docling-core release
• Regenerate the ground truth files and ensure they represent the expected serialization
• Review and approve this PR
• Make a new release of docling

Blocked by docling-project/docling-core#371

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

[mergify]

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🟢 Enforce conventional commit

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)(?:\(.+\))?(!)?:

[github-actions]

✅ DCO Check Passed

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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