[openstreetmap/openstreetmap-website] Bump acorn from 7.0.0 to 7.1.1 (#2557)

[dependabot[bot]]

Bumps [acorn](https://github.com/acornjs/acorn) from 7.0.0 to 7.1.1.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/acornjs/acorn/commit/6d194895783b03b2a37441f01857c34302eab4c8"><code>6d19489</code></a> Mark release 7.1.1</li>
<li><a href="https://github.com/acornjs/acorn/commit/793c0e569ed1158672e3a40aeed1d8518832b802"><code>793c0e5</code></a> More rigorously check surrogate pairs in regexp validator</li>
<li><a href="https://github.com/acornjs/acorn/commit/b5c17877ac0511e31579ea31e7650ba1a5871e51"><code>b5c1787</code></a> Fix incorrect comment in regexp parser</li>
<li><a href="https://github.com/acornjs/acorn/commit/12ae8fed7ebc5b7c894c5976575f33cf36a223cc"><code>12ae8fe</code></a> Parameterize dummy value and export <code>isDummy</code></li>
<li><a href="https://github.com/acornjs/acorn/commit/fa3ad8cef0f39f5ae0cbd8be0bf65eb0a782133e"><code>fa3ad8c</code></a> Further refine acorn-walk types</li>
<li><a href="https://github.com/acornjs/acorn/commit/1d5028637852c2834091739646e25dd6558ee7a8"><code>1d50286</code></a> Fix some errors in walk types</li>
<li><a href="https://github.com/acornjs/acorn/commit/97801f0b5835bc93739666b3494c9b49aeb5fc1d"><code>97801f0</code></a> Mark acorn-walk 7.1.1</li>
<li><a href="https://github.com/acornjs/acorn/commit/e9372c151f63fe254c7f5e7ffd7a820e34422208"><code>e9372c1</code></a> Further clean up walker types</li>
<li><a href="https://github.com/acornjs/acorn/commit/de6edeb654cf665e732d822d95c97e2d2fc879bc"><code>de6edeb</code></a> Remove NarrowNode from walk.d.ts</li>
<li><a href="https://github.com/acornjs/acorn/commit/1d85e7ce982a979bb5411cd00fd9156eecf952a5"><code>1d85e7c</code></a> Fix: acorn-walk type work with acorn's</li>
<li>Additional commits viewable in <a href="https://github.com/acornjs/acorn/compare/7.0.0...7.1.1">compare view</a></li>
</ul>
</details>
<br />


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</details>
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2557

-- Commit Summary --

  * Bump acorn from 7.0.0 to 7.1.1

-- File Changes --

    M yarn.lock (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2557.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2557.diff

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