bug: github.com/liamg/jfather package doesn't decode unicode characters

[DmitriyLewen]

Description

We use github.com/liamg/jfather package to get line numbers for json files.
But it returns error for unicode characters:

➜ cat composer.lock| grep descr
      "description": "Erg\u041f\u0440nzung",
....
2025-01-13T13:37:02+06:00	DEBUG	Walk error	file_path="composer.lock" err="parse error: failed to parse composer.lock: decode error: error at line 17, column 33: invalid unicode character 'invalid syntax'"

This happens because strconv.Unquote returns an error if the string doesn't contain quotes.

Discussed in #8230