更新预发布版本号至2.6.0 (#270)

Author: rinnein

metadata.data.ts

@@ -2,7 +2,7 @@ export default {
   load() {
     return {
       easytier_latest_version: '2.4.5',
-      easytier_pre_release_version: '2.5.0',
+      easytier_pre_release_version: '2.6.0',
       github_accels: [
         'https://ghfast.top/',
         'https://v6.gh-proxy.org/',