AUTHORS file is iso-8859-1 and should be utf-8

[Scott]

Hello,
License files, https://peps.python.org/pep-0639/, "MUST be UTF-8 encoded". The `AUTHORS` file is iso-8859-1 via command:

```bash
% file -b --mime-encoding ./AUTHORS
iso-8859-1
```

Here is a potential fix:

```bash
% iconv -f $(file -b --mime-encoding ./AUTHORS) -t utf-8 ./AUTHORS > ./AUTHORS.TXT;
% mv ./AUTHORS.TXT ./AUTHORS
% file -b --mime-encoding ./AUTHORS
utf-8
```

I've included the output `AUTHORS` file from above for convenience.

[Leonard Richardson (leonardr)]

Thanks for taking the time to file this issue. The converted AUTHORS file is in revision 81e279b.