test(qwen3_tts): accept the mapper argument in the code2wav weight-loader double

Nightly 3034 (Simple · Model Executor Test) failed 11 cases in
tests/model_executor/models/qwen3_tts/test_qwen3_tts_code2wav.py with

    TypeError: _FakeAutoWeightsLoader.load_weights() got an unexpected keyword argument 'mapper'

vLLM 0.29 removed skip_prefixes from AutoWeightsLoader, so on this branch
Qwen3TTSCode2Wav.load_weights passes the "encoder." exclusion as a
WeightsMapper via load_weights(weights, mapper=...). The test double still
modelled the old one-argument signature. Let it accept the keyword.
Branch-only rebase fallout; no production code changed.

Validation: tests/model_executor/models/qwen3_tts passes (232 tests).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MpXe2LeRrUQGjZfKFaocMZ
Signed-off-by: tzhouam <tzhouam@connect.ust.hk>

tests/model_executor/models/qwen3_tts/test_qwen3_tts_code2wav.py

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
-# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM-Omni project
 
 from types import SimpleNamespace
 from unittest.mock import patch
@@ -157,7 +157,10 @@ def _load_weights_noop(model: Qwen3TTSCode2Wav) -> set[str]:
         def __init__(self, *_: object, **__: object):
             pass
 
-        def load_weights(self, _weights: object) -> set[str]:
+        def load_weights(self, _weights: object, *, mapper: object | None = None) -> set[str]:
+            # vLLM 0.29 dropped skip_prefixes from AutoWeightsLoader; the model
+            # now passes the stage exclusions as a WeightsMapper instead.
+            del mapper
             return {"decoder.fake_weight"}
 
     with (