build(deps): bump git2 from 0.20.3 to 0.20.4 (#258)

Bumps [git2](https://github.com/rust-lang/git2-rs) from 0.20.3 to
0.20.4.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/rust-lang/git2-rs/blob/git2-0.20.4/CHANGELOG.md">git2's
changelog</a>.</em></p>
<blockquote>
<h2>0.20.4 - 2026-02-02</h2>
<p><a
href="https://github.com/rust-lang/git2-rs/compare/git2-0.20.3...git2-0.20.4">0.20.3...0.20.4</a></p>
<h3>Fixed</h3>
<ul>
<li>Fix undefined behavior when dereferencing empty <code>Buf</code>.
<a
href="https://redirect.github.com/rust-lang/git2-rs/pull/1213">#1213</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rust-lang/git2-rs/commit/8852d7dabd38d0df6d4524e04a1c2ee520ac7203"><code>8852d7d</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-lang/git2-rs/issues/1214">#1214</a>
from weihanglo/backport-from-raw-parts</li>
<li><a
href="https://github.com/rust-lang/git2-rs/commit/0b274f76f70f717c3bda4be1f79ba8e1cb11afd4"><code>0b274f7</code></a>
Bump to 0.20.4</li>
<li><a
href="https://github.com/rust-lang/git2-rs/commit/73a5d5d7c49a7eb9d17c2ab6e40dafe3765ebf4d"><code>73a5d5d</code></a>
Add test for dereference of an empty Buf</li>
<li><a
href="https://github.com/rust-lang/git2-rs/commit/ce566831eb188b0fdb27962e154b8da6103071bf"><code>ce56683</code></a>
fix: check ptr nullity before calling from_raw_parts</li>
<li>See full diff in <a
href="https://github.com/rust-lang/git2-rs/compare/git2-0.20.3...git2-0.20.4">compare
view</a></li>
</ul>
</details>
<br />


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Cargo.lock

@@ -20,7 +20,7 @@ clap = { version = "4.5.54", features = ["derive"] }
 colored = "3.0.0"
 fast-glob = "1.0.0"
 futures = "0.3.31"
-git2 = "0.20.3"
+git2 = "0.20.4"
 log = { version = "0.4.29", features = ["std"] }
 quick-xml = { version = "0.38.4", features = ["serialize"] }
 regex = "1.12.2"
@@ -36,7 +36,7 @@ which = "8.0.0"
 [dev-dependencies]
 mockito = "1.7.1"
 tempfile = "3.24.0"
-git2 = { version = "0.20.3", features = ["https"]}
+git2 = { version = "0.20.4", features = ["https"]}
 
 [features]
 openssl-vendored = ["git2/vendored-openssl", "reqwest/native-tls-vendored"]