email: improve bytes handling (#9032)

stdlib/email/mime/application.pyi

@@ -8,7 +8,7 @@ __all__ = ["MIMEApplication"]
 class MIMEApplication(MIMENonMultipart):
     def __init__(
         self,
-        _data: str | bytes,
+        _data: str | bytes | bytearray,
         _subtype: str = ...,
         _encoder: Callable[[MIMEApplication], object] = ...,
         *,

stdlib/email/mime/audio.pyi

@@ -8,7 +8,7 @@ __all__ = ["MIMEAudio"]
 class MIMEAudio(MIMENonMultipart):
     def __init__(
         self,
-        _audiodata: str | bytes,
+        _audiodata: str | bytes | bytearray,
         _subtype: str | None = ...,
         _encoder: Callable[[MIMEAudio], object] = ...,
         *,

stdlib/email/mime/image.pyi

@@ -8,7 +8,7 @@ __all__ = ["MIMEImage"]
 class MIMEImage(MIMENonMultipart):
     def __init__(
         self,
-        _imagedata: str | bytes,
+        _imagedata: str | bytes | bytearray,
         _subtype: str | None = ...,
         _encoder: Callable[[MIMEImage], object] = ...,
         *,