judge: fix secret calc

packages/hydrojudge/package.json

@@ -1,7 +1,7 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.12.0",
+    "version": "2.12.1",
     "main": "package.json",
     "author": "undefined <i@undefined.moe>",
     "repository": "https://github.com/hydro-dev/Hydro.git",

packages/hydrojudge/src/hosts/hydro.ts

@@ -109,7 +109,7 @@ class JudgeTask {
         this.config = await readCases(
             this.folder,
             { detail: this.session.config.detail, ...this.config },
-            { next: this.next, key: md5(`${this.source}${getConfig('secret')}`) },
+            { next: this.next, key: md5(`${this.source}/${getConfig('secret')}`) },
         );
         this.stat.judge = new Date();
         const type = this.config.type || 'default';