Fix: get_forward_msg 接口返回类型注释错误

[This-is-XiaoDeng]

根据 OneBot V11 标准，get_forward_msg 的响应数据应该是 dict[str, Any]，而不是 None

OneBot V11 标准原文

get_forward_msg 获取合并转发消息

参数

字段名	数据类型	说明
id	string	合并转发 ID

响应数据

字段名	类型	说明
message	message	消息内容，使用 消息的数组格式 表示，数组中的消息段全部为 node 消息段

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (51f114b) 67.70% compared to head (b94309f) 67.70%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #88   +/-   ##
=======================================
  Coverage   67.70%   67.70%           
=======================================
  Files          23       23           
  Lines        2081     2081           
=======================================
  Hits         1409     1409           
  Misses        672      672           

Flag	Coverage Δ
unittests	67.70% <ø> (ø)

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