[cffi] Accept floats in cast (#15487)

Author: aochagavia

stubs/cffi/cffi/api.pyi

@@ -43,7 +43,7 @@ class FFI:
         free: Callable[[CData], Any] | None = None,
         should_clear_after_alloc: bool = True,
     ) -> _cffi_backend._Allocator: ...
-    def cast(self, cdecl: str | CType, source: CData | int) -> CData: ...
+    def cast(self, cdecl: str | CType, source: CData | float) -> CData: ...
     def string(self, cdata: CData, maxlen: int = -1) -> bytes | str: ...
     def unpack(self, cdata: CData, length: int) -> bytes | str | list[Any]: ...
     @overload