🐛 修复发送图片失败的问题

[A-kirami]

这个 PR 带来了什么样的更改？

• [x] 错误修复
• [ ] 新功能
• [ ] 文档/注释
• [ ] 代码格式
• [ ] 代码重构
• [ ] 测试用例
• [ ] 性能优化
• [ ] 外观样式
• [ ] 项目构建
• [ ] 依赖环境
• [ ] 持续集成/部署
• [ ] 其他，请描述:

这个 PR 是否存在破坏性变更？

• [ ] 是的，并已在 issue #___ 号中获得批准
• [x] 没有

描述

图片从 gocq 下载转为插件自身下载

动机和背景

其他信息

检查工作

• [ ] 我对我的代码进行了注释，特别是在难以理解的部分
• [ ] 我的更改需要更新文档，并且已对文档进行了相应的更改
• [ ] 我添加了测试并且已经在本地通过，以证明我的修复补丁或新功能有效
• [ ] 我已检查并确保更改没有与其他打开的 Pull Requests 重复

[sourcery-ai[bot]]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.19%.

Quality metrics	Before	After	Change
Complexity	7.65 ⭐	7.53 ⭐	-0.12 👍
Method Length	62.40 🙂	63.40 🙂	1.00 👎
Working memory	7.89 🙂	7.97 🙂	0.08 👎
Quality	67.52% 🙂	67.33% 🙂	-0.19% 👎

Other metrics	Before	After	Change
Lines	106	109	3

Changed files	Quality Before	Quality After	Quality Change
nonebot_plugin_moyu/__init__.py	67.52% 🙂	67.33% 🙂	-0.19% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
nonebot_plugin_moyu/__init__.py	moyu	19 😞	163 😞	13 😞	39.22% 😞	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
nonebot_plugin_moyu/__init__.py	handle_time	6 ⭐	128 😞	8 🙂	63.74% 🙂	Try splitting into smaller methods

Legend and Explanation

The emojis denote the absolute quality of the code:

• ⭐ excellent
• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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Please see our documentation here for details on how these metrics are calculated.

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