Bump git2 from 0.20.3 to 0.20.4 (#470)

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 />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=git2&package-manager=cargo&previous-version=0.20.3&new-version=0.20.4)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
`@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot show <dependency name> ignore conditions` will show all
of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop
Dependabot creating any more for this major version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop
Dependabot creating any more for this minor version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop
Dependabot creating any more for this dependency (unless you reopen the
PR or upgrade to it yourself)
You can disable automated security fix PRs for this repo from the
[Security Alerts
page](https://github.com/paritytech/revive/network/alerts).

</details>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: xermicus <cyrill@parity.io>

Cargo.lock

@@ -3966,9 +3966,9 @@ checksum = "e629b9b98ef3dd8afe6ca2bd0f89306cec16d43d907889945bc5d6687f2f13c7"
 
 [[package]]
 name = "git2"
-version = "0.20.3"
+version = "0.20.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e2b37e2f62729cdada11f0e6b3b6fe383c69c29fc619e391223e12856af308c"
+checksum = "7b88256088d75a56f8ecfa070513a775dd9107f6530ef14919dac831af9cfe2b"
 dependencies = [
  "bitflags 2.10.0",
  "libc",

Cargo.toml

@@ -61,7 +61,7 @@ env_logger = { version = "0.11.8", default-features = false }
 serde_stacker = "0.1.14"
 criterion = { version = "0.8", features = ["html_reports"] }
 log = { version = "0.4.28" }
-git2 = { version = "0.20.2", default-features = false }
+git2 = { version = "0.20.4", default-features = false }
 downloader = "0.2.8"
 flate2 = "1.1"
 fs_extra = "1.3"