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MINOR: [JS] Bump ix from 6.0.0 to 7.0.0 in /js (#43898)

Bumps [ix](https://github.com/ReactiveX/IxJS) from 6.0.0 to 7.0.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/ReactiveX/IxJS/releases">ix's releases</a>.</em></p>
<blockquote>
<h2>v7.0.0</h2>
<h3>Bug Fixes</h3>
<ul>
<li><strong>actions:</strong> fix docs workflow (<a href="https://github.com/ReactiveX/IxJS/commit/512e370f428a970f1f55dbf3a0dcd528e3bbc0ba">512e370</a>)</li>
<li><strong>changelog:</strong> include latest changelog in npm packages (<a href="https://github.com/ReactiveX/IxJS/commit/f25687b46a547b510184ff6558884628e37063b5">f25687b</a>)</li>
</ul>
<h3>chore</h3>
<ul>
<li><strong>build:</strong> fix gulp async task completion (<a href="https://github.com/ReactiveX/IxJS/commit/c68e97c91d565baf33de989d3f6190a8b5046adc">c68e97c</a>)</li>
<li><strong>release:</strong> 7.0.0 (<a href="https://github.com/ReactiveX/IxJS/commit/b8890f1010347ac2242398801d1405e51a4d3396">b8890f1</a>)</li>
</ul>
<h3>Documentation</h3>
<ul>
<li>
<p><strong>CHANGELOG:</strong> 7.0.0 (<a href="https://github.com/ReactiveX/IxJS/commit/28a24f945dc2f5ba05669399713b6e2299ebb28c">28a24f9</a>)</p>
</li>
<li>
<p>Fix exports (<a href="https://redirect.github.com/ReactiveX/IxJS/issues/371">#371</a>) (<a href="https://github.com/ReactiveX/IxJS/commit/d461eae02cc63bafc4e3256d5d59541d1ff7e43f">d461eae</a>), closes <a href="https://redirect.github.com/ReactiveX/IxJS/issues/371">#371</a></p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/ReactiveX/IxJS/blob/master/CHANGELOG.md">ix's changelog</a>.</em></p>
<blockquote>
<h1><a href="https://github.com/ReactiveX/IxJS/compare/v6.0.0...v7.0.0">7.0.0</a> (2024-07-10)</h1>
<h3>Bug Fixes</h3>
<ul>
<li><strong>actions:</strong> fix docs workflow (<a href="https://github.com/ReactiveX/IxJS/commit/512e370f428a970f1f55dbf3a0dcd528e3bbc0ba">512e370</a>)</li>
<li><strong>changelog:</strong> include latest changelog in npm packages (<a href="https://github.com/ReactiveX/IxJS/commit/f25687b46a547b510184ff6558884628e37063b5">f25687b</a>)</li>
</ul>
<h3>chore</h3>
<ul>
<li>
<p><strong>build:</strong> fix gulp async task completion (<a href="https://github.com/ReactiveX/IxJS/commit/c68e97c91d565baf33de989d3f6190a8b5046adc">c68e97c</a>)</p>
</li>
<li>
<p>Fix exports (<a href="https://redirect.github.com/ReactiveX/IxJS/issues/371">#371</a>) (<a href="https://github.com/ReactiveX/IxJS/commit/d461eae02cc63bafc4e3256d5d59541d1ff7e43f">d461eae</a>), closes <a href="https://redirect.github.com/ReactiveX/IxJS/issues/371">#371</a></p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/ReactiveX/IxJS/commit/b8890f1010347ac2242398801d1405e51a4d3396"><code>b8890f1</code></a> chore(release): 7.0.0</li>
<li><a href="https://github.com/ReactiveX/IxJS/commit/28a24f945dc2f5ba05669399713b6e2299ebb28c"><code>28a24f9</code></a> docs(CHANGELOG): 7.0.0</li>
<li><a href="https://github.com/ReactiveX/IxJS/commit/f25687b46a547b510184ff6558884628e37063b5"><code>f25687b</code></a> fix(changelog): include latest changelog in npm packages</li>
<li><a href="https://github.com/ReactiveX/IxJS/commit/c68e97c91d565baf33de989d3f6190a8b5046adc"><code>c68e97c</code></a> chore(build): fix gulp async task completion</li>
<li><a href="https://github.com/ReactiveX/IxJS/commit/512e370f428a970f1f55dbf3a0dcd528e3bbc0ba"><code>512e370</code></a> fix(actions): fix docs workflow</li>
<li><a href="https://github.com/ReactiveX/IxJS/commit/d461eae02cc63bafc4e3256d5d59541d1ff7e43f"><code>d461eae</code></a> Fix exports (<a href="https://redirect.github.com/ReactiveX/IxJS/issues/371">#371</a>)</li>
<li>See full diff in <a href="https://github.com/ReactiveX/IxJS/compare/v6.0.0...v7.0.0">compare view</a></li>
</ul>
</details>
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Authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>