fix: can't update user info to db , fix issue:#7141

[MisterChangRay]

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What is the purpose of the change

修复 #7141 的问题

后台管理系统登录后, 在NacosAuthManager.login 方法中, 将登录的用户信息存于 HttpServletRequest.setAttribute 。
此种方式在ajax异步请求时， RequestUtil.getUser不能成功的访问到用户信息, 从而不能记录用户更新信息
更换为 req.getSession().setAttribute

Brief changelog

将用户数据从 HttpServletRequest 中迁移到 HttpSession 中进行保存

Verifying this change

已验证在修改和删除时能成功记录

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