Fix wrong key type in multipart decoder #353
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The header is parsed into a CaseInsensitiveDict which keys are specified to be strings, but it was here set to bytes. https://github.com/psf/requests/blob/51716c4ef390136b0d4b800ec7665dd5503e64fc/requests/structures.py#L20
This fix removes the encoding that converted the parsed keys back to bytes.