Argument Clinic: fix bare "type" in annotations

Bare "type" in annotations should be equivalent to "type[Any]"; see
https://discuss.python.org/t/inconsistencies-between-type-and-type/37404
and python/mypy#16366. It's better to use "type[object]", which is
safer and unambiguous.

Tools/clinic/clinic.py

@@ -3184,7 +3184,7 @@ def closure(f: CConverterClassT) -> CConverterClassT:
 
 class CConverterAutoRegister(type):
     def __init__(
-        cls, name: str, bases: tuple[type, ...], classdict: dict[str, Any]
+        cls, name: str, bases: tuple[type[object], ...], classdict: dict[str, Any]
     ) -> None:
         converter_cls = cast(type["CConverter"], cls)
         add_c_converter(converter_cls)
@@ -4347,7 +4347,7 @@ class buffer: pass
 class rwbuffer: pass
 class robuffer: pass
 
-StrConverterKeyType = tuple[frozenset[type], bool, bool]
+StrConverterKeyType = tuple[frozenset[type[object]], bool, bool]
 
 def str_converter_key(
     types: TypeSet, encoding: bool | str | None, zeroes: bool
@@ -4846,7 +4846,7 @@ class CReturnConverterAutoRegister(type):
     def __init__(
             cls: ReturnConverterType,
             name: str,
-            bases: tuple[type, ...],
+            bases: tuple[type[object], ...],
             classdict: dict[str, Any]
     ) -> None:
         add_c_return_converter(cls)