fix(download): use numeric sort key for artifact version URLs

[Prakhar54-byte]

Resolves #70

version_urls.sort(reverse=True) performs a plain lexicographic sort, which returns the wrong 'latest' version for semver-style IDs (e.g. 2.10.0 sorts before 2.9.0 as strings, making 2.9.0 the 'latest').

This PR adds a _parse_version_key() helper that splits the trailing URL segment on non-digit characters and compares each part as an integer, yielding correct numeric ordering. Date-style versions (e.g. 2022.12.01) continue to work correctly.

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• databusclient/api/download.py

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