fix(animals): replace dead catboys/waifu.pics endpoints with nekos.best

- api.catboys.com/img fails TLS (unrecognized_name) -> nekos.best/api/v2/neko
- api.waifu.pics/sfw/waifu does not resolve -> nekos.best/api/v2/waifu
- nekos.best returns HTTP 200 for okhttp/5.5.0 UA, shape {results:[{url}]}

src/main/java/creator/loki/feature/animals/AnimalApi.java

@@ -110,12 +110,12 @@ public class AnimalApi {
     WAIFU(
         "🌸",
         List.of(
-            new Endpoint("https://api.waifu.pics/sfw/waifu", objectKey("url")),
+            new Endpoint("https://nekos.best/api/v2/waifu", firstArrayObjectKey("url")),
             new Endpoint(NEKOS_BASE + "waifu", objectKey("url")))),
     CATBOY(
         "😼",
         List.of(
-            new Endpoint("https://api.catboys.com/img", objectKey("url")),
+            new Endpoint("https://nekos.best/api/v2/neko", firstArrayObjectKey("url")),
             new Endpoint(NEKOS_BASE + "neko", objectKey("url"))));
 
     private final String emoji;