chore: update onInit type

Author: denolfe

src/config/types.ts

@@ -67,7 +67,7 @@ export type InitOptions = {
   secret: string;
   email?: EmailOptions;
   local?: boolean;
-  onInit?: (payload: Payload) => Promise<void>;
+  onInit?: (payload: Payload) => Promise<void> | void;
   /** Pino LoggerOptions */
   loggerOptions?: LoggerOptions;
 };
@@ -193,7 +193,7 @@ export type Config = {
   };
   plugins?: Plugin[];
   telemetry?: boolean;
-  onInit?: (payload: Payload) => Promise<void>
+  onInit?: (payload: Payload) => Promise<void> | void
 };
 
 export type SanitizedConfig = Omit<DeepRequired<Config>, 'collections' | 'globals'> & {