[CI][CPU] Improve dummy Triton interfaces and fix the CPU CI (#19838)

Signed-off-by: jiang1.li <jiang1.li@intel.com>

vllm/triton_utils/importing.py

@@ -68,9 +68,11 @@ class TritonPlaceholder(types.ModuleType):
 
     def __init__(self):
         super().__init__("triton")
+        self.__version__ = "3.3.0"
         self.jit = self._dummy_decorator("jit")
         self.autotune = self._dummy_decorator("autotune")
         self.heuristics = self._dummy_decorator("heuristics")
+        self.Config = self._dummy_decorator("Config")
         self.language = TritonLanguagePlaceholder()
         logger.warning_once(
             "Triton is not installed. Using dummy decorators. "