fix redis import in rank command

Author: secondubly

src/bot/commands/rank.ts

@@ -1,5 +1,5 @@
 import type { Command, MMRHistory } from '@lib/bot/types.js'
-import redisClient from '@lib/utils/redis'
+import redisClient from '@lib/utils/redis.js'
 
 const DEADLOCK_RANKS = new Map<number, string>([
     [0, 'Obscurus'],