Fix payload variable name in add_song_to_playlist method

[nogaemer]

Updated payload variable to fix spotapi.exceptions.errors.SongError: Could not like song.

[Copilot]

Pull request overview

This PR fixes a bug in the like_song method by correcting the payload variable key name in the API request. The change updates the variables key from "uris" to "libraryItemUris" to match the expected format of Spotify's addToLibrary API endpoint, resolving a SongError: Could not like song exception.

Key Changes:

• Updated the payload variables key in the like_song method's API request from "uris" to "libraryItemUris"

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[Aran404]

Hey, thank you very much for the contribution. Has this been tested? If so, I'll merge it into the main branch. Happy holidays!

[nogaemer]

Yes, I tested that.
Apparently Spotify has updated its API. I'm pretty sure the same problem applies to the add_songs_to_playlist function in song.py, but I haven't really tested that yet.

By the way, thank you for this project!