Bump async from 3.2.0 to 3.2.2 in /backend#216

Bumps [async](https://github.com/caolan/async) from 3.2.0 to 3.2.2. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/caolan/async/blob/master/CHANGELOG.md">async's changelog</a>.</em></p> <blockquote> <h1>v3.2.2</h1> <ul> <li>Fix potential prototype pollution exploit</li> </ul> <h1>v3.2.1</h1> <ul> <li>Use <code>queueMicrotask</code> if available to the environment (<a href="https://github-redirect.dependabot.com/caolan/async/issues/1761">#1761</a>)</li> <li>Minor perf improvement in <code>priorityQueue</code> (<a href="https://github-redirect.dependabot.com/caolan/async/issues/1727">#1727</a>)</li> <li>More examples in documentation (<a href="https://github-redirect.dependabot.com/caolan/async/issues/1726">#1726</a>)</li> <li>Various doc fixes (<a href="https://github-redirect.dependabot.com/caolan/async/issues/1708">#1708</a>, <a href="https://github-redirect.dependabot.com/caolan/async/issues/1712">#1712</a>, <a href="https://github-redirect.dependabot.com/caolan/async/issues/1717">#1717</a>, <a href="https://github-redirect.dependabot.com/caolan/async/issues/1740">#1740</a>, <a href="https://github-redirect.dependabot.com/caolan/async/issues/1739">#1739</a>, <a href="https://github-redirect.dependabot.com/caolan/async/issues/1749">#1749</a>, <a href="https://github-redirect.dependabot.com/caolan/async/issues/1756">#1756</a>)</li> <li>Improved test coverage (<a href="https://github-redirect.dependabot.com/caolan/async/issues/1754">#1754</a>)</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/caolan/async/commit/acc084e6916a86e02ac5de8dbda0517e33106bf5"><code>acc084e</code></a> Version 3.2.2</li> <li><a href="https://github.com/caolan/async/commit/acd731602c16b22e1e171bb2fe73c0617f4f07c4"><code>acd7316</code></a> Update built files</li> <li><a href="https://github.com/caolan/async/commit/b50d64827c6c3b11c74d30d2b5d8445f8c3fdffe"><code>b50d648</code></a> update changelog for 3.2.2</li> <li><a href="https://github.com/caolan/async/commit/e1ecdbf79264f9ab488c7799f4c76996d5dca66d"><code>e1ecdbf</code></a> Fix prototype pollution vulnerability</li> <li><a href="https://github.com/caolan/async/commit/fc9ba651341af5ab974aade6b1640e345912be83"><code>fc9ba65</code></a> Fix(docs): use plural <code>callbacks</code> word in <code>lib/map.js</code> (<a href="https://github-redirect.dependabot.com/caolan/async/issues/1765">#1765</a>)</li> <li><a href="https://github.com/caolan/async/commit/b1b69b03b35022c6c9dfb8f4b9c1ace8f1baf5be"><code>b1b69b0</code></a> regen docs</li> <li><a href="https://github.com/caolan/async/commit/cac52e3978ad4675fb37995076a6331117bd99af"><code>cac52e3</code></a> update changelog</li> <li><a href="https://github.com/caolan/async/commit/d1af0450d4525f66dfcc31f9effaf01f09c6819e"><code>d1af045</code></a> Version 3.2.1</li> <li><a href="https://github.com/caolan/async/commit/b31840ed1f35c178d8f4850ad26ebd42eaae79d9"><code>b31840e</code></a> Update built files</li> <li><a href="https://github.com/caolan/async/commit/159a119fbb1a585c61f33b4b3b5036f5d332ebbb"><code>159a119</code></a> Enhance examples for Collections methods. (<a href="https://github-redirect.dependabot.com/caolan/async/issues/1726">#1726</a>)</li> <li>Additional commits viewable in <a href="https://github.com/caolan/async/compare/v3.2.0...v3.2.2">compare view</a></li> </ul> </details> <br /> [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. 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