Bump nhsuk-frontend from 9.6.3 to 9.6.4 (#394)

Bumps [nhsuk-frontend](https://github.com/nhsuk/nhsuk-frontend) from
9.6.3 to 9.6.4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/nhsuk/nhsuk-frontend/releases">nhsuk-frontend's
releases</a>.</em></p>
<blockquote>
<h2>v9.6.4</h2>
<h2>9.6.4 - 10 July 2025</h2>
<p>Note: This release was created from the <code>support/9.x</code>
branch.</p>
<p>:wrench: <strong>Fixes</strong></p>
<ul>
<li><a
href="https://redirect.github.com/nhsuk/nhsuk-frontend/pull/1471">#1471:
Fix styles for button as link :visited when :active and :focus</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/nhsuk/nhsuk-frontend/blob/v9.6.4/CHANGELOG.md">nhsuk-frontend's
changelog</a>.</em></p>
<blockquote>
<h2>9.6.4 - 10 July 2025</h2>
<p>Note: This release was created from the <code>support/9.x</code>
branch.</p>
<p>:wrench: <strong>Fixes</strong></p>
<ul>
<li><a
href="https://redirect.github.com/nhsuk/nhsuk-frontend/pull/1471">#1471:
Fix styles for button as link :visited when :active and :focus</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/nhsuk/nhsuk-frontend/commit/67e94f77fafc5e8dc763971476243ed82e33b39b"><code>67e94f7</code></a>
Merge pull request <a
href="https://redirect.github.com/nhsuk/nhsuk-frontend/issues/1472">#1472</a>
from nhsuk/v9-fix-button-visited-bug-1372</li>
<li><a
href="https://github.com/nhsuk/nhsuk-frontend/commit/afc0634e6ac32852642a142482c28df2e7b42c75"><code>afc0634</code></a>
Bump version for v9.6.4 release</li>
<li><a
href="https://github.com/nhsuk/nhsuk-frontend/commit/887598b018a00cb312165a2f8f58b23f73d72855"><code>887598b</code></a>
add changelog entry</li>
<li><a
href="https://github.com/nhsuk/nhsuk-frontend/commit/af9ab51be591dbca8c04fad302e70207ed6bc1cd"><code>af9ab51</code></a>
fix button styles for visited link buttons when active and focus fixes
<a
href="https://redirect.github.com/nhsuk/nhsuk-frontend/issues/1372">#1372</a></li>
<li>See full diff in <a
href="https://github.com/nhsuk/nhsuk-frontend/compare/v9.6.3...v9.6.4">compare
view</a></li>
</ul>
</details>
<br />


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package-lock.json

@@ -32,7 +32,7 @@
     "gulp-rename": "^2.1.0",
     "gulp-sass": "^5.1.0",
     "lodash": "^4.17.21",
-    "nhsuk-frontend": "^9.6.3",
+    "nhsuk-frontend": "^9.6.4",
     "nunjucks": "^3.2.4",
     "path": "^0.12.7",
     "sass-embedded": "1.89.2"