test: cover parse_version_string branches

[eeshsaxena]

Description

weaviate.util.parse_version_string turns a version string into a
(major, minor) tuple (stripping a leading v, defaulting a missing minor to
0, ignoring the patch, and raising on unparseable input). The existing suite
only asserted that v-prefixed and bare versions parse equal, leaving the
other branches uncovered.

This adds test/test_parse_version_string.py covering:

• major/minor parsed with the patch ignored
• a leading v being stripped
• a version with no minor defaulting to 0 (e.g. "2" -> (2, 0))
• ValueError on unparseable / empty input

No source changes.

Verification

pytest test/test_parse_version_string.py - 8 passed. ruff check /
ruff format --check clean.

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[weaviate-git-bot]

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