Fix mac CI

Author: cwfitzgerald

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
             os: "ubuntu-latest"
             target: "x86_64-unknown-linux-gnu"
           - name: "mac"
-            os: ["macOS", "gpu"]
+            os: "macos-14"
             target: "aarch64-apple-darwin"
           - name: "windows"
             os: "windows-latest"