chore(deps): Bump lodash from 4.17.11 to 4.17.21 in /demo/frontend (#687)

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.11 to
4.17.21.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="f299b52f39"><code>f299b52</code></a>
Bump to v4.17.21</li>
<li><a
href="c4847ebe7d"><code>c4847eb</code></a>
Improve performance of <code>toNumber</code>, <code>trim</code> and
<code>trimEnd</code> on large input strings</li>
<li><a
href="3469357cff"><code>3469357</code></a>
Prevent command injection through <code>_.template</code>'s
<code>variable</code> option</li>
<li><a
href="ded9bc6658"><code>ded9bc6</code></a>
Bump to v4.17.20.</li>
<li><a
href="63150ef764"><code>63150ef</code></a>
Documentation fixes.</li>
<li><a
href="00f0f62a97"><code>00f0f62</code></a>
test.js: Remove trailing comma.</li>
<li><a
href="846e434c7a"><code>846e434</code></a>
Temporarily use a custom fork of <code>lodash-cli</code>.</li>
<li><a
href="5d046f39cb"><code>5d046f3</code></a>
Re-enable Travis tests on <code>4.17</code> branch.</li>
<li><a
href="aa816b36d4"><code>aa816b3</code></a>
Remove <code>/npm-package</code>.</li>
<li><a
href="d7fbc52ee0"><code>d7fbc52</code></a>
Bump to v4.17.19</li>
<li>Additional commits viewable in <a
href="https://github.com/lodash/lodash/compare/4.17.11...4.17.21">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/~bnjmnt4n">bnjmnt4n</a>, a new releaser for
lodash since your current version.</p>
</details>
<br />


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demo/frontend/package-lock.json

@@ -1562,10 +1562,6 @@
         "styled-components": ">= 2"
       }
     },
-    "node_modules/babel-plugin-styled-components/node_modules/lodash": {
-      "version": "4.17.11",
-      "license": "MIT"
-    },
     "node_modules/babel-plugin-syntax-jsx": {
       "version": "6.18.0",
       "license": "MIT"
@@ -3457,6 +3453,11 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/lodash": {
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
+    },
     "node_modules/lodash.merge": {
       "version": "4.6.2",
       "dev": true,