tools(deps-dev): Update vimeo/psalm requirement from 6.8.6 to 6.8.8 in /tools/psalm (#512)

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>6.8.8</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<h3>Fixes</h3>
<ul>
<li>Fix Could not locate trait statement errors by <a
href="https://github.com/danog"><code>@​danog</code></a> in <a
href="https://redirect.github.com/vimeo/psalm/pull/11341">vimeo/psalm#11341</a></li>
</ul>
<h3>Internal changes</h3>
<ul>
<li>Improve debugging of PHP bugs by <a
href="https://github.com/danog"><code>@​danog</code></a> in <a
href="https://redirect.github.com/vimeo/psalm/pull/11339">vimeo/psalm#11339</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/vimeo/psalm/compare/6.8.7...6.8.8">https://github.com/vimeo/psalm/compare/6.8.7...6.8.8</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/vimeo/psalm/commit/1361cd33008feb3ae2b4a93f1860e14e538ec8c2"><code>1361cd3</code></a>
Merge pull request <a
href="https://redirect.github.com/vimeo/psalm/issues/11341">#11341</a>
from vimeo/fix_trait_case_sensitive</li>
<li><a
href="https://github.com/vimeo/psalm/commit/f541b02166502c641378af62926028c5cd8bd7bf"><code>f541b02</code></a>
cs-fix</li>
<li><a
href="https://github.com/vimeo/psalm/commit/268f2b82a95d993ff488e3ee8a73305a7ce77a86"><code>268f2b8</code></a>
Fix Could not locate trait statement errors due to case sensitive
lookups</li>
<li><a
href="https://github.com/vimeo/psalm/commit/7a0d2cb470abf6a33bd51b9caab68f7f5d6c94ee"><code>7a0d2cb</code></a>
Improve logs</li>
<li><a
href="https://github.com/vimeo/psalm/commit/fb990b463fad5b1ba38ab43b13c4b00f92a8d3f2"><code>fb990b4</code></a>
Improve logs</li>
<li><a
href="https://github.com/vimeo/psalm/commit/b7bb8459c99f4068bc1841542bd172db6e008f4d"><code>b7bb845</code></a>
Merge pull request <a
href="https://redirect.github.com/vimeo/psalm/issues/11339">#11339</a>
from vimeo/improve_debugging</li>
<li><a
href="https://github.com/vimeo/psalm/commit/76163ce63cf4f5d6c262473f1f86b92fc3795308"><code>76163ce</code></a>
Improve debugging of PHP bugs</li>
<li><a
href="https://github.com/vimeo/psalm/commit/4258dc813b28c2b03865f34a17ddf072f006b357"><code>4258dc8</code></a>
Merge pull request <a
href="https://redirect.github.com/vimeo/psalm/issues/11335">#11335</a>
from vimeo/allow_roundingmode</li>
<li><a
href="https://github.com/vimeo/psalm/commit/38e543b5126f91917766fc44442c1f40d6c64626"><code>38e543b</code></a>
Fixup</li>
<li><a
href="https://github.com/vimeo/psalm/commit/32aba2988e3e2b3fdff4ac892c9585bfe285856f"><code>32aba29</code></a>
Allow RoundingMode as param to round</li>
<li>Additional commits viewable in <a
href="https://github.com/vimeo/psalm/compare/6.8.6...6.8.8">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": "6.8.6"
+        "vimeo/psalm": "6.8.8"
     },
     "prefer-stable": true,
     "config": {