fix(plugin_test): 修复 NoneBot 2.3.0 添加的 HTTP 客户端会话支持导致测试失败的问题

[shoucandanghehe]

由于 NoneBot 2.3.0 对 HTTPClientMixin 基类新增了抽象方法 get_session，所以现有的 fake driver 会导致启动混合驱动类时报错

    05-01 20:02:48 [SUCCESS] nonebot | NoneBot is initializing...
    05-01 20:02:48 [INFO] nonebot | Current Env: prod
    Traceback (most recent call last):
      File "/home/runner/work/registry/registry/plugin_test/nonebot-plugin-tetris-stats-nonebot_plugin_tetris_stats-test/runner.py", line 15, in <module>
        init()
      File "/home/runner/work/registry/registry/plugin_test/nonebot-plugin-tetris-stats-nonebot_plugin_tetris_stats-test/.venv/lib/python3.10/site-packages/nonebot/__init__.py", line 319, in init
        _driver = DriverClass(env, config)
    TypeError: Can't instantiate abstract class Driver with abstract method get_session

[he0119]

好好好

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.13%. Comparing base (fe97955) to head (5837d88).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #218   +/-   ##
=======================================
  Coverage   98.13%   98.13%           
=======================================
  Files          17       17           
  Lines         966      966           
=======================================
  Hits          948      948           
  Misses         18       18           

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