gpu_init: satisfy the import-hoist lint in the compile-thread patch

The checker does not count attribute assignment on an aliased module
import as a use and flagged _zoo_common as added-but-unused. Set the
attribute through importlib.import_module instead; importlib is already
a module-level import here. Behaviour unchanged.

unsloth/_gpu_init.py

@@ -199,8 +199,10 @@ if os.environ.get("UNSLOTH_FORCE_SINGLE_COMPILE_WORKER", "0") == "1":
         pass
     os.environ["TORCHINDUCTOR_COMPILE_THREADS"] = "1"
     try:
-        from unsloth_zoo.temporary_patches import common as _zoo_common
-        _zoo_common.determine_compile_threads = lambda: 1
+        setattr(
+            importlib.import_module("unsloth_zoo.temporary_patches.common"),
+            "determine_compile_threads", lambda: 1,
+        )
     except Exception:
         pass