Describe the bug
When instantiating SpeechToTextTool with a model parameter (e.g. SpeechToTextTool(model="openai/whisper-small")), the class raises a TypeError because the overridden __new__ method incorrectly forwards *args and **kwargs to super().__new__(), which does not expect these arguments.

Code to reproduce the error

from smolagents.default_tools import SpeechToTextTool

speech_to_text_tool = SpeechToTextTool(model="openai/whisper-small")

Error logs (if any)
Traceback (most recent call last):
File "/path/to/project/bug_demo.py", line 3, in
speech_to_text_tool = SpeechToTextTool(model="openai/whisper-small")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/path/to/project/venv/lib/python3.12/site-packages/smolagents/default_tools.py", line 499, in new
return super().new(cls, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: object.new() takes exactly one argument (the type to instantiate)

Expected behavior
The instance of SpeechToTextTool should be created successfully when passing keyword arguments like model=... or other arguments accepted in PipelineTool.__init__ method without raising a TypeError.

Packages version:
smolagents==1.17.0

Additional context

The issue can be fixed by not forwarding *args and **kwargs in __new__, i.e., changing the return line to:

return super().__new__(cls)

This allows instance initialization with parameters to proceed in __init__ without breaking instance creation.