Bump eventsource from 1.0.7 to 1.1.1 in /frontend#214

Bumps [eventsource](https://github.com/EventSource/eventsource) from 1.0.7 to 1.1.1. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/EventSource/eventsource/blob/master/HISTORY.md">eventsource's changelog</a>.</em></p> <blockquote> <h1><a href="https://github.com/EventSource/eventsource/compare/v1.1.0...v1.1.1">1.1.1</a></h1> <ul> <li>Do not include authorization and cookie headers on redirect to different origin (<a href="https://github-redirect.dependabot.com/EventSource/eventsource/pull/273">#273</a> Espen Hovlandsdal)</li> </ul> <h1><a href="https://github.com/EventSource/eventsource/compare/v1.0.7...v1.1.0">1.1.0</a></h1> <ul> <li>Improve performance for large messages across many chunks (<a href="https://github-redirect.dependabot.com/EventSource/eventsource/pull/130">#130</a> Trent Willis)</li> <li>Add <code>createConnection</code> option for http or https requests (<a href="https://github-redirect.dependabot.com/EventSource/eventsource/pull/120">#120</a> Vasily Lavrov)</li> <li>Support HTTP 302 redirects (<a href="https://github-redirect.dependabot.com/EventSource/eventsource/pull/116">#116</a> Ryan Bonte)</li> <li>Prevent sequential errors from attempting multiple reconnections (<a href="https://github-redirect.dependabot.com/EventSource/eventsource/pull/125">#125</a> David Patty)</li> <li>Add <code>new</code> to correct test (<a href="https://github-redirect.dependabot.com/EventSource/eventsource/pull/101">#111</a> Stéphane Alnet)</li> <li>Fix reconnections attempts now happen more than once (<a href="https://github-redirect.dependabot.com/EventSource/eventsource/pull/136">#136</a> Icy Fish)</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/EventSource/eventsource/commit/aa7a40843a978f42c0babdec125bf9e0a83bf515"><code>aa7a408</code></a> 1.1.1</li> <li><a href="https://github.com/EventSource/eventsource/commit/56d489ef853a891deca121bbd463c732fee94dce"><code>56d489e</code></a> chore: rebuild polyfill</li> <li><a href="https://github.com/EventSource/eventsource/commit/4a951e58b04118c9c4d3da3d27d454972a1b4b8d"><code>4a951e5</code></a> docs: update history for 1.1.1</li> <li><a href="https://github.com/EventSource/eventsource/commit/f9f6416567bff62c1af2f4314be51d9870e94bc2"><code>f9f6416</code></a> fix: strip sensitive headers on redirect to different origin</li> <li><a href="https://github.com/EventSource/eventsource/commit/9dd06876ab43af37c3313c679fbdc7f722293a0d"><code>9dd0687</code></a> 1.1.0</li> <li><a href="https://github.com/EventSource/eventsource/commit/49497ba7107a7a94d7dbc73b6e5cc0117f8606e8"><code>49497ba</code></a> Update history for 1.1.0 (<a href="https://github-redirect.dependabot.com/EventSource/eventsource/issues/146">#146</a>)</li> <li><a href="https://github.com/EventSource/eventsource/commit/3a3853793f63eb5dab9d863504817a9d37b992e6"><code>3a38537</code></a> Update history for <a href="https://github-redirect.dependabot.com/EventSource/eventsource/issues/136">#136</a></li> <li><a href="https://github.com/EventSource/eventsource/commit/46fe04e03e54f4129a28bf75b3a1e5f4ab68b52a"><code>46fe04e</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/EventSource/eventsource/issues/136">#136</a> from icy-fish/master</li> <li><a href="https://github.com/EventSource/eventsource/commit/9a4190f65e761ee672d786a6d01c60392950064b"><code>9a4190f</code></a> Fix issue: reconnection only happends for 1 time after connection drops</li> <li><a href="https://github.com/EventSource/eventsource/commit/61e1b19c8616aa151835a4ae599b299afb574ebf"><code>61e1b19</code></a> test: destroy both proxied request and response on close</li> <li>Additional commits viewable in <a href="https://github.com/EventSource/eventsource/compare/v1.0.7...v1.1.1">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. 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