fix: Use timezone-aware datetime

[Ritinikhil]

Summary

Replace deprecated datetime.utcnow() with datetime.now(timezone.utc) in profiling utilities.

Motivation

datetime.utcnow() is deprecated as of Python 3.12 (see PEP 587 and Python docs).

Changes

• Import timezone from datetime module
• Replace datetime.utcnow() with datetime.now(timezone.utc)

Testing

No functional change - the returned timestamps are equivalent but now timezone-aware.

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Related Documentation

Checked 14 published document(s) in 1 knowledge base(s). No updates required.

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[Copilot]

Pull request overview

This PR modernizes the profiling utilities by replacing the deprecated datetime.utcnow() with datetime.now(timezone.utc) to comply with Python 3.12 deprecations and produce timezone-aware timestamps.

Changes:

• Updated import statement to include timezone from the datetime module
• Replaced deprecated datetime.utcnow() call with datetime.now(timezone.utc) for timezone-aware timestamp generation
• Minor code cleanup: removed unnecessary .keys() call when checking dictionary membership

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[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling/utils/profiling.py	33.33%	2 Missing ⚠️

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[cau-git]

@Ritinikhil Looks like a valid contribution, can you please fix the formatting/linting issues?

You should always rely on the pre-commit toolchain for this in docling.

[dolfim-ibm]

lgtm