debug DiscordGuildCache

- avoid ratelimit.

webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/utils/DiscordGuildCache.kt

@@ -4,6 +4,7 @@ import applicationHttpClient
 import io.ktor.client.call.*
 import io.ktor.client.request.*
 import io.ktor.http.*
+import kotlinx.coroutines.delay
 import kotlinx.serialization.Serializable
 import space.mori.chzzk_bot.webserver.DiscordGuildListAPI
 import space.mori.chzzk_bot.webserver.dotenv
@@ -57,6 +58,7 @@ object DiscordGuildCache {
                 )
             }
             lastGuildId = guilds.last().id
+            delay(300)
         }
     }
 }