Version bump and os error (#807)

python/mlx/_os_warning.py

@@ -0,0 +1,9 @@
+import platform
+
+if platform.system() == "Darwin":
+    version = tuple(map(int, platform.mac_ver()[0].split(".")))
+    major, minor = version[0], version[1]
+    if (major, minor) < (13, 5):
+        raise ImportError(
+            f"Only macOS 13.5 and newer are supported, not {major}.{minor}"
+        )