chore(deps): bump gix from 0.83.0 to 0.84.0 in /robot-repo-automaton (#241)

Bumps [gix](https://github.com/GitoxideLabs/gitoxide) from 0.83.0 to
0.84.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/GitoxideLabs/gitoxide/releases">gix's
releases</a>.</em></p>
<blockquote>
<h2>gix v0.84.0</h2>
<h3>New Features (BREAKING)</h3>
<ul>
<li>Allow checkouts of empty repositories
Also make turn <code>destination_must_be_empty</code> into
<code>Option&lt;bool&gt;</code></li>
</ul>
<h3>New Features</h3>
<ul>
<li>Add <code>SHA-256</code> support for object-format parsing.</li>
</ul>
<h3>Bug Fixes</h3>
<ul>
<li>
<p>Follow submodule gitdir files when opening and perform basic
validation
Modern submodules store a .git file in the worktree whose gitdir: value
points
at the repository to open. The previous resolver treated every
non-directory
.git path like an uninitialized submodule and fell back to
.git/modules/<!-- raw HTML omitted -->,
which can open the wrong repository after a submodule gitdir is
relocated or
renamed. That shows up as phantom submodule HEAD changes in gix
status.</p>
<p>Git baseline: Git setup.c::read_gitfile_gently() parses gitdir:
files and resolves relative targets against the .git file location;
submodule.c::submodule_to_gitdir() consults that gitfile before falling
back to
the name-derived .git/modules path.</p>
<p>Update Submodule::git_dir_try_old_form() to validate the submodule
name, then
follow worktree .git files when present while preserving the old-form
directory
and uninitialized fallback behavior. Validate present gitdir file
targets for
direct state/open/status queries so broken submodule checkouts are
reported
if the gitlink doesn't point to a directory.
For status ignore=all, still parse valid gitdir files to keep state
accurate,
but skip target validation and fall back without error if the gitdir
file itself
is malformed or unreadable. Derive State::is_old_form directly from
whether
the worktree .git path is a directory so a divergent modern gitlink is
not
misclassified as old form.</p>
</li>
<li>
<p><code>Repository::is_dirty()</code> won't fail on unborn
repositories</p>
</li>
</ul>
<h3>Commit Statistics</h3>
<ul>
<li>37 commits contributed to the release over the course of 28 calendar
days.</li>
<li>28 days passed between releases.</li>
<li>4 commits were understood as <a
href="https://www.conventionalcommits.org">conventional</a>.</li>
<li>2 unique issues were worked on: #, <a
href="https://redirect.github.com/GitoxideLabs/gitoxide/issues/2585">#2585</a></li>
</ul>
<h3>Commit Details</h3>
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<ul>
<li><strong>#</strong></li>
</ul>
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</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/GitoxideLabs/gitoxide/commit/10c58bb56597d9335611da121aac21f9b09b6e5b"><code>10c58bb</code></a>
Release gix-error v0.2.4, gix-date v0.15.4, gix-actor v0.41.1, gix-trace
v0.1...</li>
<li><a
href="https://github.com/GitoxideLabs/gitoxide/commit/b6c41cb5474b77e4eeedbb11cd321d48b3e7623a"><code>b6c41cb</code></a>
Montly report for May 2026</li>
<li><a
href="https://github.com/GitoxideLabs/gitoxide/commit/faecc2373d4b82f0856edbfa964280ab2134b8a5"><code>faecc23</code></a>
Merge pull request <a
href="https://redirect.github.com/GitoxideLabs/gitoxide/issues/2607">#2607</a>
from SarthakB11/fix/issue-1842</li>
<li><a
href="https://github.com/GitoxideLabs/gitoxide/commit/8323858295164d23c25ebca52f6b9b01eeca885d"><code>8323858</code></a>
fix: Derive <code>$0</code> for <code>sh -c</code> from the shell's
basename</li>
<li><a
href="https://github.com/GitoxideLabs/gitoxide/commit/d62e33c725d4a2a3415b9d31554d5fa39e0fed73"><code>d62e33c</code></a>
Add tests for <code>$0</code> deriving from the actually-running
shell</li>
<li><a
href="https://github.com/GitoxideLabs/gitoxide/commit/f6433acf3ae34e2349dd970633ee428490aeff34"><code>f6433ac</code></a>
Update downstream test assertions for sh $0 change</li>
<li><a
href="https://github.com/GitoxideLabs/gitoxide/commit/6752a964b1e24bf79d1bda4e9cddd6e404646f2d"><code>6752a96</code></a>
Pass sh (not --) as $0 to sh -c</li>
<li><a
href="https://github.com/GitoxideLabs/gitoxide/commit/43774856ea44f6ec2176802aca0bc5facd7c7ad7"><code>4377485</code></a>
Merge pull request <a
href="https://redirect.github.com/GitoxideLabs/gitoxide/issues/2612">#2612</a>
from GitoxideLabs/improvements</li>
<li><a
href="https://github.com/GitoxideLabs/gitoxide/commit/123cdaf01e0ba7eea82d5acd1f2362cb2e236a85"><code>123cdaf</code></a>
<code>spawn_git_daemon</code> now spawns the git daemon on a free port
automatically</li>
<li><a
href="https://github.com/GitoxideLabs/gitoxide/commit/cad26e94a6f711105a08e39998f0a64d0a3903ba"><code>cad26e9</code></a>
fix: disable automatic Git maintenance in gix-testtools, add
`apply_git_confi...</li>
<li>Additional commits viewable in <a
href="https://github.com/GitoxideLabs/gitoxide/compare/gix-v0.83.0...gix-v0.84.0">compare
view</a></li>
</ul>
</details>
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