fix: update discord api endpoint urls

discordapp.com url planned to be discontinued 7th november

ejb/src/main/java/org/keycloak/social/discord/DiscordIdentityProvider.java

@@ -41,10 +41,10 @@ public class DiscordIdentityProvider extends AbstractOAuth2IdentityProvider<Disc
 
     private static final Logger log = Logger.getLogger(DiscordIdentityProvider.class);
 
-    public static final String AUTH_URL = "https://discordapp.com/api/oauth2/authorize";
-    public static final String TOKEN_URL = "https://discordapp.com/api/oauth2/token";
-    public static final String PROFILE_URL = "https://discordapp.com/api/users/@me";
-    public static final String GROUP_URL = "https://discordapp.com/api/users/@me/guilds";
+    public static final String AUTH_URL = "https://discord.com/api/oauth2/authorize";
+    public static final String TOKEN_URL = "https://discord.com/api/oauth2/token";
+    public static final String PROFILE_URL = "https://discord.com/api/users/@me";
+    public static final String GROUP_URL = "https://discord.com/api/users/@me/guilds";
     public static final String DEFAULT_SCOPE = "identify email";
     public static final String GUILDS_SCOPE = "guilds";