Bump test262 from `85373b4` to `f6c48f3` (#2414)

Bumps [test262](https://github.com/tc39/test262) from `85373b4` to `f6c48f3`.
<details>
<summary>Commits</summary>
<ul>
<li><a href="f6c48f333e"><code>f6c48f3</code></a> Update Intl tests to recognize microsecond and nanosecond as sanctioned</li>
<li><a href="5d8ebdff05"><code>5d8ebdf</code></a> Improve documentation for assert.compareIterator.</li>
<li><a href="745f3c01aa"><code>745f3c0</code></a> Add more tests for duplicated named capture groups.</li>
<li><a href="54c9ff9084"><code>54c9ff9</code></a> Rename duplicate-names.js.</li>
<li><a href="c3c6c86663"><code>c3c6c86</code></a> Fix some esids.</li>
<li><a href="9e1907e5f7"><code>9e1907e</code></a> Unicode case-folding tests</li>
<li><a href="c44d82c370"><code>c44d82c</code></a> Add <code>/iu</code> Unicode case folding tests</li>
<li><a href="27063ae219"><code>27063ae</code></a> Duplicate named capture groups: .groups and .indices.groups objects</li>
<li><a href="fabb1fd379"><code>fabb1fd</code></a> Duplicate named capture groups: Fix match arrays</li>
<li><a href="d77d9b2b85"><code>d77d9b2</code></a> Duplicate named capture groups: Syntax tests</li>
<li>Additional commits viewable in <a href="85373b4ce1...f6c48f333e">compare view</a></li>
</ul>
</details>
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</details>

test262

@@ -1 +1 @@
-Subproject commit 85373b4ce12a908f8fc517093d95cf2ed2f5ee6a
+Subproject commit f6c48f333e7d16bf11b30cd29b4ea9ac0354f142