Bump handlebars from 4.1.2 to 4.7.6 in /frontend/frontendapp#7

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.1.2 to 4.7.6. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md">handlebars's changelog</a>.</em></p> <blockquote> <h2>v4.7.6 - April 3rd, 2020</h2> <p>Chore/Housekeeping:</p> <ul> <li><a href="https://github-redirect.dependabot.com/wycats/handlebars.js/issues/1672">#1672</a> - Switch cmd parser to latest minimist (<a href="https://api.github.com/users/dougwilson">@dougwilson</a></li> </ul> <p>Compatibility notes:</p> <ul> <li>Restored Node.js compatibility</li> </ul> <p><a href="https://github.com/wycats/handlebars.js/compare/v4.7.5...v4.7.6">Commits</a></p> <h2>v4.7.5 - April 2nd, 2020</h2> <p>Chore/Housekeeping:</p> <ul> <li><del>Node.js version support has been changed to v6+</del> Reverted in 4.7.6</li> </ul> <p>Compatibility notes:</p> <ul> <li><del>Node.js &lt; v6 is no longer supported</del> Reverted in 4.7.6</li> </ul> <p><a href="https://github.com/wycats/handlebars.js/compare/v4.7.4...v4.7.5">Commits</a></p> <h2>v4.7.4 - April 1st, 2020</h2> <p>Chore/Housekeeping:</p> <ul> <li><a href="https://github-redirect.dependabot.com/wycats/handlebars.js/issues/1666">#1666</a> - Replaced minimist with yargs for handlebars CLI (<a href="https://api.github.com/users/aorinevo">@aorinevo</a>, <a href="https://api.github.com/users/AviVahl">@AviVahl</a> &amp; <a href="https://api.github.com/users/fabb">@fabb</a>)</li> </ul> <p>Compatibility notes:</p> <ul> <li>No incompatibilities are to be expected</li> </ul> <p><a href="https://github.com/wycats/handlebars.js/compare/v4.7.3...v4.7.4">Commits</a></p> <h2>v4.7.3 - February 5th, 2020</h2> <p>Chore/Housekeeping:</p> <ul> <li><a href="https://github-redirect.dependabot.com/wycats/handlebars.js/issues/1644">#1644</a> - Download links to aws broken on handlebarsjs.com - access denied (<a href="https://api.github.com/users/Tea56">@Tea56</a>)</li> <li>Fix spelling and punctuation in changelog - d78cc73</li> </ul> <p>Bugfixes:</p> <ul> <li>Add Type Definition for Handlebars.VERSION, Fixes <a href="https://github-redirect.dependabot.com/wycats/handlebars.js/issues/1647">#1647</a> - 4de51fe</li> <li>Include Type Definition for runtime.js in Package - a32d05f</li> </ul> <p>Compatibility notes:</p> <!-- raw HTML omitted --> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/handlebars-lang/handlebars.js/commit/e6ad93ea01bcde1f8ddaa4b4ebe572dd616abfaa"><code>e6ad93e</code></a> v4.7.6</li> <li><a href="https://github.com/handlebars-lang/handlebars.js/commit/2bf4fc6fd3ae3d8f076d628653f284d85faebeb4"><code>2bf4fc6</code></a> Update release notes</li> <li><a href="https://github.com/handlebars-lang/handlebars.js/commit/b64202bc9197307bd785a58693e3820eb9bb41a8"><code>b64202b</code></a> Update release-notes.md</li> <li><a href="https://github.com/handlebars-lang/handlebars.js/commit/c2f1e6203178918569f085e12afdb762cae17fb0"><code>c2f1e62</code></a> Switch cmd parser to latest minimist</li> <li><a href="https://github.com/handlebars-lang/handlebars.js/commit/08e9a11a34c3ad8387a0b85b1334f97cab85191a"><code>08e9a11</code></a> Revert &quot;chore: set Node.js compatibility to v6+&quot;</li> <li><a href="https://github.com/handlebars-lang/handlebars.js/commit/1fd2edee2a12fb228061fcde807905c6b14339c4"><code>1fd2ede</code></a> v4.7.5</li> <li><a href="https://github.com/handlebars-lang/handlebars.js/commit/3c9c2f5cf29cf10f54d5fe4daca6b24b65f0adcf"><code>3c9c2f5</code></a> Update release notes</li> <li><a href="https://github.com/handlebars-lang/handlebars.js/commit/16487a088e13f4d52c6fd6610b9ec71c4a51be8a"><code>16487a0</code></a> chore: downgrade yargs to v14</li> <li><a href="https://github.com/handlebars-lang/handlebars.js/commit/309d2b49a11628d2a8f052c5587e7459968cd705"><code>309d2b4</code></a> chore: set Node.js compatibility to v6+</li> <li><a href="https://github.com/handlebars-lang/handlebars.js/commit/645ac73844918668f9a2f41e49b7cb18ce5abf36"><code>645ac73</code></a> test: fix integration tests</li> <li>Additional commits viewable in <a href="https://github.com/wycats/handlebars.js/compare/v4.1.2...v4.7.6">compare view</a></li> </ul> </details> <details> <summary>Maintainer changes</summary> <p>This version was pushed to npm by <a href="https://www.npmjs.com/~erisds">erisds</a>, a new releaser for handlebars since your current version.</p> </details> <br /> [](https://docs.github.com/en/github/managing-security-vulnerabilities/configuring-github-dependabot-security-updates) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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