Release: v2.3.1

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.20%. Comparing base (3b40e5b) to head (a223011). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2725 +/- ## ========================================== + Coverage 94.15% 94.20% +0.04% ========================================== Files 48 48 Lines 4054 4054 ========================================== + Hits 3817 3819 +2 + Misses 237 235 -2 ``` | [Flag](https://app.codecov.io/gh/nonebot/nonebot2/pull/2725/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nonebot) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nonebot/nonebot2/pull/2725/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nonebot) | `94.20% <ø> (+0.04%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nonebot#carryforward-flags-in-the-pull-request-comment) to find out more.

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[github-actions[bot]]

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