fix: add missing font download in the rapidocr artifacts

[dolfim-ibm]

Add missing font download in the rapidocr artifacts.

Issue resolved by this Pull Request:
Resolves docling-project/docling-serve#375

Checklist:

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

[dosubot]

Related Documentation

Checked 5 published document(s) in 1 knowledge base(s). No updates required.

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

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✅ DCO Check Passed

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling/models/rapid_ocr_model.py	50.00%	1 Missing ⚠️

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