fix(core): match documented ValueError in as_bytes driver test

The as_bytes() method raises ValueError for unsupported backends (per
its docstring and matching the test directly above this one). The
driver-backend skip-guarded test was asserting RuntimeError, so it
always failed on CTK 12.9.1 runners where the skip condition does not
apply.

Author: cpcloud

cuda_core/tests/test_linker.py

@@ -225,7 +225,7 @@ def test_linker_options_as_bytes_invalid_backend():
 def test_linker_options_as_bytes_driver_not_supported():
     """Test that as_bytes() is not supported for driver backend"""
     options = LinkerOptions(arch="sm_80")
-    with pytest.raises(RuntimeError, match="as_bytes\\(\\) only supports 'nvjitlink' backend"):
+    with pytest.raises(ValueError, match="as_bytes\\(\\) only supports 'nvjitlink' backend"):
         options.as_bytes("driver")