tools(deps-dev): Update vimeo/psalm requirement from 6.15.0 to 6.15.1 in /tools/psalm (#602)

Updates the requirements on
[vimeo/psalm](https://github.com/vimeo/psalm) to permit the latest
version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/vimeo/psalm/releases">vimeo/psalm's
releases</a>.</em></p>
<blockquote>
<h2>6.15.1</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<h3>Internal changes</h3>
<ul>
<li>Allow sebastian/diff 8 by <a
href="https://github.com/Jean85"><code>@​Jean85</code></a> in <a
href="https://redirect.github.com/vimeo/psalm/pull/11667">vimeo/psalm#11667</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/vimeo/psalm/compare/6.15.0...6.15.1">https://github.com/vimeo/psalm/compare/6.15.0...6.15.1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/vimeo/psalm/commit/28dc127af1b5aecd52314f6f645bafc10d0e11f9"><code>28dc127</code></a>
Merge pull request <a
href="https://redirect.github.com/vimeo/psalm/issues/11667">#11667</a>
from Jean85/patch-2</li>
<li><a
href="https://github.com/vimeo/psalm/commit/73e058026aa5b10ccd4558ea351ab15318229b3a"><code>73e0580</code></a>
Allow sebastian/diff 8</li>
<li>See full diff in <a
href="https://github.com/vimeo/psalm/compare/6.15.0...6.15.1">compare
view</a></li>
</ul>
</details>
<br />


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tools/psalm/composer.json

@@ -7,7 +7,7 @@
     },
     "require-dev": {
         "roave/security-advisories": "dev-latest",
-        "vimeo/psalm": "6.15.0"
+        "vimeo/psalm": "6.15.1"
     },
     "prefer-stable": true,
     "config": {