Update dependency hexo to v5.1.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
hexo (source)	devDependencies	minor	5.0.0 -> 5.1.1

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Release Notes

hexojs/hexo

v5.1.1

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Changes

• fix(filter/highlight): avoid escaping curly bracket when highlight & prismjs disabled @​curbengh [#​4489]
  • When both highlight.js and prismjs are disabled:

_config.yml

highlight:
enable: false

prismjs
enable: false

* there was an issue that curly brackets `{ }` are escaped `&#​123; &#​125;` mistakenly in the [backtick_code_block.js](https://github.com/hexojs/hexo/blob/5795c1225f602ff0d5848fecf560fd33409cd96f/lib/plugins/filter/before_post_render/backtick_code_block.js) filter. The fix is to avoid running that filter when code highlight is disabled.
* Some users disable Hexo's default code highlight as they prefer to their own method.

v5.1.0

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Features

• feat(highlight): parse 'caption' option to prismHighlight @​curbengh [#​4476]
  • caption is now available in prismjs:

_config.yml

highlight:
enable: false
prismjs:
enable: true

* It can be used in triple backtick codeblock:
<pre><code>``` js caption
console.log('foo')
```</code></pre>
  * above codeblock will be rendered as:
  (class attributes are omitted for brevity)
  ``` html
  <pre><div class="caption"><span>caption</span></div><code>console...</code></pre>
  ```
  * you can style the caption by:
  ``` css
  pre div.caption {
    font-size: 0.9em;
    color: #&#8203;888;
  }

  pre div.caption a {
    float: right;
  }
  ```
* also available via [`codeblock`](https://hexo.io/docs/tag-plugins#Code-Block) and [`include_code`](https://hexo.io/docs/tag-plugins#Include-Code) tag plugins.

- fix: refactor post escape @&#8203;SukkaW [#&#8203;4472]
* fixed issue with prismjs that, in some cases, did not remove hexo's processing tag properly
- Remove plugins option in config @&#8203;stevenjoezhang [#&#8203;4475]
``` yml
### _config.yml
plugins:

• plugins option has been deprecated long ago and it's now completely dropped
• plugins should be saved in scripts/ folder or installed via npm package.json.

Performance

• perf(backtick_code): avoid duplicated escaping @​SukkaW [#​4478]

v5.0.2

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Changes

• Revert "perf: avoid running plugins in 'clean' command" [#​4386] @​curbengh [#​4470]
  • This fixes error in hexo clean.

v5.0.1

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Changes

• fix(helpers): call url_for from hexo-util @​curbengh [#​4447]
  • helpers are now accessible from APIs such as Injector
• perf(external_link): update regexp @​SukkaW [#​4467]
  • regex of external_link filter now pre-match external links, instead of solely rely on isExternalLink
• perf(injector): shorthand optimization @​SukkaW [#​4462]

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