Bump markdown from 1.0.0-alpha.18 to 1.0.0-alpha.19 (#136)

Bumps [markdown](https://github.com/wooorm/markdown-rs) from
1.0.0-alpha.18 to 1.0.0-alpha.19.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/wooorm/markdown-rs/releases">markdown's
releases</a>.</em></p>
<blockquote>
<h2>1.0.0-alpha.19</h2>
<ul>
<li>2c83b0d Fix panic on incomplete closing frontmatter fence
by <a href="https://github.com/nokome"><code>@​nokome</code></a> in <a
href="https://redirect.github.com/wooorm/markdown-rs/pull/121">wooorm/markdown-rs#121</a></li>
<li>d0788c9 Update dev-dependencies
by <a href="https://github.com/wooorm"><code>@​wooorm</code></a> in <a
href="https://redirect.github.com/wooorm/markdown-rs/pull/120">wooorm/markdown-rs#120</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/wooorm/markdown-rs/compare/1.0.0-alpha.18...1.0.0-alpha.19">https://github.com/wooorm/markdown-rs/compare/1.0.0-alpha.18...1.0.0-alpha.19</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/690a0b1704ac376a4eba25d4f745d711a2cd3ad9"><code>690a0b1</code></a>
1.0.0-alpha.19</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/2c83b0d97475d28000ca3757d0da43327cea6c14"><code>2c83b0d</code></a>
Fix panic on incomplete closing frontmatter fence</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/d0788c9caa4b9622999bd24e3c8a34a7c23c02c2"><code>d0788c9</code></a>
Update dev-dependencies</li>
<li>See full diff in <a
href="https://github.com/wooorm/markdown-rs/compare/1.0.0-alpha.18...1.0.0-alpha.19">compare
view</a></li>
</ul>
</details>
<br />


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Cargo.toml

@@ -12,7 +12,7 @@ gix = { version = "0.64.0", features = [
 ] }
 http = "1.1.0"
 lazy-regex = "3.2.0"
-markdown = "1.0.0-alpha.18"
+markdown = "1.0.0-alpha.19"
 percent-encoding = "2.3.1"
 reqwest = "0.12.5"
 rsbadges = { git = "https://github.com/aschey/rsbadges", rev = "ee99a301ac9b22063464989610ed033af48856ee" }