fix: Update CUDA version to 12.4.1 for Windows build compatibility

This should resolve the 'Version not available: 12.6.0' error that was preventing
Windows binary builds. 12.4.1 is more widely available in GitHub Actions.

Will enable Windows prebuilt binaries in future releases.

Author: VMLYR-MikeKuykendall

.github/workflows/release.yml

@@ -98,7 +98,7 @@ jobs:
         if: contains(matrix.features, 'gpu') || contains(matrix.features, 'llama-cuda')
         uses: Jimver/[email protected]
         with:
-          cuda: '12.6.0'
+          cuda: '12.4.1'
 
       - name: Install system dependencies (Linux)
         if: runner.os == 'Linux'