fix: spotify removed 6 api endpoints without prior notice

Its not working.

Error: Not Found
Error: Not Found

https://github.com/spotify-web-api-java/spotify-web-api-java/blob/master/examples/data/artists/GetArtistsRelatedArtistsExample.java

also;

https://github.com/spotify-web-api-java/spotify-web-api-java/blob/master/examples/data/browse/GetRecommendationsExample.java

