Fix KMD version test to allow 2-tuple on WSL

Windows driver version strings only have two components, so
nvmlSystemGetDriverVersion returns X.Y on WSL instead of X.Y.Z.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: leofang

cuda_core/cuda/core/system/_system.pyx

@@ -41,7 +41,7 @@ def get_driver_version() -> tuple[tuple[int, ...], tuple[int, ...]]:
     version : tuple[tuple[int, ...], tuple[int, ...]]
         ``(umd_version, kmd_version)`` where ``umd_version`` is typically
         a 2-tuple ``(MAJOR, MINOR)`` and ``kmd_version`` is typically
-        a 3-tuple ``(MAJOR, MINOR, PATCH)``.
+        a 3-tuple ``(MAJOR, MINOR, PATCH)`` (2-tuple on WSL).
 
     Raises
     ------

cuda_core/tests/system/test_system_system.py

@@ -30,13 +30,14 @@ def test_driver_version():
     expected_umd = (version // 1000, (version % 1000) // 10)
     assert umd == expected_umd, "UMD driver version does not match expected value"
 
-    # KMD: 3-tuple (major, minor, patch)
+    # KMD: 3-tuple (major, minor, patch), or 2-tuple on WSL
     assert isinstance(kmd, tuple)
-    assert len(kmd) == 3
-    ver_maj, ver_min, ver_patch = kmd
+    assert len(kmd) in (2, 3)
+    ver_maj, ver_min, *ver_patch = kmd
     assert 400 <= ver_maj < 1000
     assert ver_min >= 0
-    assert 0 <= ver_patch <= 99
+    if ver_patch:
+        assert 0 <= ver_patch[0] <= 99
 
 
 def test_num_devices():