chardet: UniversalDetector.feed accepts bytearray

Technically it accepts any buffer, but the inline type annotations
now say bytes | bytearray, so let's stick to that.

Part of python#9006

stubs/chardet/chardet/universaldetector.pyi

@@ -25,5 +25,5 @@ class UniversalDetector:
     logger: Logger
     def __init__(self, lang_filter: int = 31) -> None: ...
     def reset(self) -> None: ...
-    def feed(self, byte_str: bytes) -> None: ...
+    def feed(self, byte_str: bytes | bytearray) -> None: ...
     def close(self) -> _FinalResultType: ...