Fix compatibility issues and download speed problems

[rootphantomer]

1、修复第一次下载完最新核心执行文件后，不兼容旧版本yaml，导致日志报：

2023/08/14 19:51:13.781764 [info] Upgrade yaml: 5 to 6
2023/08/14 19:51:13.778894 [info] AdGuard Home, version v0.107.36
2023/08/14 19:51:08.739051 [fatal] unexpected type of clients: []interface {}
2023/08/14 19:51:08.738965 [info] Upgrade yaml: 5 to 6
2023/08/14 19:51:08.734928 [info] AdGuard Home, version v0.107.36 

从而无法启动程序
2、加速核心文件下载速度

[rootphantomer]

作者如果能看到的话，把这个项目的issue开一下