build(deps): bump keyring from 25.5.0 to 25.6.0 in /tools/publish (#3236)

Bumps [keyring](https://github.com/jaraco/keyring) from 25.5.0 to
25.6.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/jaraco/keyring/blob/main/NEWS.rst">keyring's
changelog</a>.</em></p>
<blockquote>
<h1>v25.6.0</h1>
<h2>Features</h2>
<ul>
<li>Avoid logging a warning when config does not specify a backend. (<a
href="https://redirect.github.com/jaraco/keyring/issues/682">#682</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/jaraco/keyring/commit/a9a7624b5d7eda87257d2da082abc5f195eae50f"><code>a9a7624</code></a>
Finalize</li>
<li><a
href="https://github.com/jaraco/keyring/commit/21680c682c35032a0131104f00d2f9e2d13a301f"><code>21680c6</code></a>
Merge pull request <a
href="https://redirect.github.com/jaraco/keyring/issues/702">#702</a>
from jfly/issue-682</li>
<li><a
href="https://github.com/jaraco/keyring/commit/bf80b69eeefdd41c8ccfc545a61d48f8e18aea20"><code>bf80b69</code></a>
Add news fragment.</li>
<li><a
href="https://github.com/jaraco/keyring/commit/1526c17f38538491d6ceee3b03015047ae49a92f"><code>1526c17</code></a>
Don't log a warning when the <code>backend</code> config section is
missing</li>
<li><a
href="https://github.com/jaraco/keyring/commit/edaa964d4b1a90ba564ddafd2471523f12cd8e8c"><code>edaa964</code></a>
Merge <a
href="https://github.com/jaraco/skeleton">https://github.com/jaraco/skeleton</a></li>
<li><a
href="https://github.com/jaraco/keyring/commit/5c34e69568f23a524af4fa9dad3f5e80f22ec3e6"><code>5c34e69</code></a>
Use extend for proper workaround.</li>
<li><a
href="https://github.com/jaraco/keyring/commit/1119d7b6c7cc69ef42101f26f9d7a3a62a2e0373"><code>1119d7b</code></a>
Merge <a
href="https://github.com/jaraco/skeleton">https://github.com/jaraco/skeleton</a></li>
<li><a
href="https://github.com/jaraco/keyring/commit/750a1891ec4a1c0602050e3463e9593a8c13aa14"><code>750a189</code></a>
Require Python 3.9 or later now that Python 3.8 is EOL.</li>
<li><a
href="https://github.com/jaraco/keyring/commit/e61a9df7cdc9c8d1b56c30b7b3f94a7cdac14414"><code>e61a9df</code></a>
Include pyproject.toml in ruff.toml.</li>
<li><a
href="https://github.com/jaraco/keyring/commit/db4dfc495552aca8d6f05ed58441fa65fdc2ed9c"><code>db4dfc4</code></a><code>jaraco/skeleton#151</code></li>
<li>See full diff in <a
href="https://github.com/jaraco/keyring/compare/v25.5.0...v25.6.0">compare
view</a></li>
</ul>
</details>
<br />


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Author: dependabot[bot]