Reading discordmanifest artifact had errors! - 'charmap' codec can't decode byte 0x9d in position 1331: character maps to <undefined>

Hi,

I was trying to parse an iTunes backup on Windows, and the discordManifest.py module crashes with this error:

```
Reading discordmanifest artifact had errors!
Error was 'charmap' codec can't decode byte 0x9d in position 1331: character maps to
Exception Traceback: Traceback (most recent call last):
File "C:\Users\DFIR\Downloads\iLEAPP\ileapp.py", line 426, in crunch_artifacts
artifact_data = plugin.method(files_found, category_folder, seeker, wrap_text, time_offset)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DFIR\Downloads\iLEAPP\scripts\artifacts\discordManifest.py", line 19, in get_discordManifest
for jsondata in f_in:
^^^^
File "C:\Users\DFIR\AppData\Local\Programs\Python\Python312\Lib\encodings\cp1252.py", line 23, in decode
return codecs.charmap_decode(input,self.errors,decoding_table)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 1331: character maps to
```

It seems like it is related with the `open` function missing an encoding parameter.

I added `encoding="utf8"` in it, and it is working.

But, I think that the definition of the artifact it too generic, because it is extracting not only Discord, but also other apps that have this path:
`*/mobile/Containers/Data/Application/*/Documents/RCTAsyncLocalStorage_V1/manifest.json`.

Hope it helps!

Thanks!