fix: remove index signature from base request

Author: interc0der

packages/xrpl/src/client/index.ts

@@ -343,7 +343,7 @@ class Client extends EventEmitter<EventTypes> {
     const request = {
       ...req,
       account:
-        typeof req.account === 'string'
+        "account" in req && typeof req.account === 'string'
           ? ensureClassicAddress(req.account)
           : undefined,
       api_version: req.api_version ?? this.apiVersion,

packages/xrpl/src/models/methods/baseMethod.ts

@@ -3,7 +3,6 @@ import { LedgerIndex } from '../common'
 import type { Request } from '.'
 
 export interface BaseRequest {
-  [x: string]: unknown
   /**
    * A unique value to identify this request. The response to this request uses
    * the same id field. This way, even if responses arrive out of order, you