replace String.random with randomstring

packages/hydrojudge/src/config.ts

@@ -2,7 +2,7 @@ import os from 'os';
 import path from 'path';
 import cac from 'cac';
 import Schema from 'schemastery';
-import { fs, yaml } from '@hydrooj/utils';
+import { fs, randomstring, yaml } from '@hydrooj/utils';
 
 const argv = cac().parse();
 
@@ -30,7 +30,7 @@ export const JudgeSettings = Schema.object({
     rate: Schema.number().default(1),
     env: Schema.string().default(defaultEnv),
     host: Schema.any(),
-    secret: Schema.string().description('Judge Token Secret').default(String.random(32)),
+    secret: Schema.string().description('Judge Token Secret').default(randomstring(32)),
     disable: Schema.boolean().description('Disable builtin judge').default(false),
     detail: Schema.union([
         Schema.const('full'),