chore(deps): Bump wpt from ebccc9d to 9b40ddc (#3089)

Bumps [wpt](https://github.com/web-platform-tests/wpt) from `ebccc9d` to
`9b40ddc`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/web-platform-tests/wpt/commit/9b40ddce40a2dd5eeb198bec38a8cc1f8aade594"><code>9b40ddc</code></a>
Handle cycle in inline if() function</li>
<li><a
href="https://github.com/web-platform-tests/wpt/commit/1c2ee6e3d597d717f3b81035a38e0886ddfc5db6"><code>1c2ee6e</code></a>
[PEPC] Address exploitable border styling</li>
<li><a
href="https://github.com/web-platform-tests/wpt/commit/e2f2814997e420ac6bafded2cab2c5aae73d7531"><code>e2f2814</code></a>
Fix WPTs failing since the switch to headless_shell</li>
<li><a
href="https://github.com/web-platform-tests/wpt/commit/1cea1765b9d6ee2b6ad47907e6812787080d66b6"><code>1cea176</code></a>
WebKit export of <a
href="https://bugs.webkit.org/show_bug.cgi?id=285264">https://bugs.webkit.org/show_bug.cgi?id=285264</a>
(<a
href="https://redirect.github.com/web-platform-tests/wpt/issues/50340">#50340</a>)</li>
<li><a
href="https://github.com/web-platform-tests/wpt/commit/79b8d99f0472a77dd5d0623357e8182884384c04"><code>79b8d99</code></a>
Bluetooth: Migrate some WPT tests to use Bidi SimulateAdapter</li>
<li><a
href="https://github.com/web-platform-tests/wpt/commit/f15868008b9f050098754169054785887e932936"><code>f158680</code></a>
[rust png] Stall the test HTTP request at a slightly later offset.</li>
<li><a
href="https://github.com/web-platform-tests/wpt/commit/93527fd4df9b5d9c52f226230d88334c91eecf71"><code>93527fd</code></a>
[functions] Detect cycles between &lt;dashed-functions&gt;</li>
<li><a
href="https://github.com/web-platform-tests/wpt/commit/cb9ff8ea0a8bbf0c4196d37ca9f8001328ceba47"><code>cb9ff8e</code></a>
CSS corner-shape initial parsing</li>
<li><a
href="https://github.com/web-platform-tests/wpt/commit/ebcc646d39e49426eafce4e55a3c47e7562cdb07"><code>ebcc646</code></a>
DOM: Remove impl-specific Observable error assertions</li>
<li><a
href="https://github.com/web-platform-tests/wpt/commit/bbfed1221b3ae8c8257dab2cbbea5c5c7cf2d3d6"><code>bbfed12</code></a>
Add oncommand Event Handler property to IDL</li>
<li>Additional commits viewable in <a
href="https://github.com/web-platform-tests/wpt/compare/ebccc9d428a4dacc3216b76514b2956f454aa8b9...9b40ddce40a2dd5eeb198bec38a8cc1f8aade594">compare
view</a></li>
</ul>
</details>
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