Fix GentooVersion and AlpineLinuxVersion missing __le__ and __ge__ operators

[xovishnukosuri]

Summary

Fixes #172

GentooVersion overrides __eq__, __lt__, and __gt__ to use gentoo.vercmp for correct numeric version ordering, but was missing __le__ and __ge__. The attrs-generated fallback methods compared the raw string value attribute directly, which caused lexicographic ordering instead of numeric ordering for those two operators.

Concrete example of the bug:

>>> from univers.versions import GentooVersion
>>> v1 = GentooVersion('1.2.0-r0')
>>> v2 = GentooVersion('1.10.0-r0')
>>> v1 < v2
True   # correct: gentoo.vercmp gives numeric order
>>> v1 <= v2
False  # wrong: falls back to string "1.2.0-r0" <= "1.10.0-r0" which is False lexicographically
>>> v1 >= v2
True   # wrong: same fallback issue

AlpineLinuxVersion inherits from GentooVersion so it had the same bug.

Changes

• Added __le__ and __ge__ to GentooVersion using gentoo.vercmp, consistent with the existing __lt__ and __gt__ implementations.
• AlpineLinuxVersion inherits the fix automatically since it subclasses GentooVersion.
• Added regression tests to test_versions.py for both GentooVersion and AlpineLinuxVersion covering the numeric-vs-lexicographic ordering edge case (1.2.0 < 1.10.0 numerically but > lexicographically).

Test plan

• pytest tests/test_versions.py::test_gentoo_version passes
• pytest tests/test_versions.py::test_alpine_linux_version passes
• pytest tests/test_gentoo.py passes (all 48 tests)
• Full pytest tests/test_versions.py passes (pre-existing unrelated failures in semver tests are unchanged)

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