fix UTC plugin type definitions

Author: WRMSRwasTaken

types/plugin/utc.d.ts

@@ -1,19 +1,19 @@
-import { PluginFunc, ConfigType } from 'dayjs'
+import { PluginFunc, ConfigType, OptionType } from 'dayjs'
 
 declare const plugin: PluginFunc
 export = plugin
 
 declare module 'dayjs' {
   interface Dayjs {
-    
+
     utc(keepLocalTime?: boolean): Dayjs
-    
+
     local(): Dayjs
 
     isUTC(): boolean
 
     utcOffset(offset: number | string, keepLocalTime?: boolean): Dayjs
   }
 
-  export function utc(config?: ConfigType, format?: string, strict?: boolean): Dayjs
+  export function utc(config?: ConfigType, format?: dayjs.OptionType, strict?: boolean): Dayjs
 }