fix(atst): return correct type for encodeRawKey

packages/atst/src/lib/encodeRawKey.ts

 import { ethers } from 'ethers'
 
-export const encodeRawKey = (rawKey: string) => {
+import { WagmiBytes } from '../types/WagmiBytes'
+
+export const encodeRawKey = (rawKey: string): WagmiBytes => {
   if (rawKey.length < 32) {
-    return ethers.utils.formatBytes32String(rawKey)
+    return ethers.utils.formatBytes32String(rawKey) as WagmiBytes
   }
   const hash = ethers.utils.keccak256(ethers.utils.toUtf8Bytes(rawKey))
-  return hash.slice(0, 64) + 'ff'
+  return (hash.slice(0, 64) + 'ff') as WagmiBytes
 }