rewrite spotify stored creds login, bump librespot

scripts/spotify-get-stored-creds.js

@@ -0,0 +1,9 @@
+import Spotify from './../build/streamers/spotify/main.js'
+
+const client = new Spotify({})
+await client.login(process.env.SPOTIFY_USERNAME, process.env.SPOTIFY_PASSWORD)
+
+const storedCreds = client.getStoredCredentials()
+console.log('[spotify] New config:', storedCreds)
+
+await client.disconnect()