Bump @amcharts/amcharts4 from 4.10.19 to 4.10.21 (#572)

Bumps [@amcharts/amcharts4](https://github.com/amcharts/amcharts4) from 4.10.19 to 4.10.21.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/amcharts/amcharts4/releases"><code>@​amcharts/amcharts4</code>'s releases</a>.</em></p>
<blockquote>
<h2>4.10.21</h2>
<h2>[4.10.21] - 2021-08-08</h2>
<h3>Added</h3>
<ul>
<li>Export: new setting in CSV options: <code>addBOM</code> (default <code>true</code>).</li>
</ul>
<h3>Changed</h3>
<ul>
<li><code>userClassName</code> now supports multiple class names separated by space.</li>
<li>Exporting CSV will now have add BOM code to exported file.</li>
<li>Upgrading to <code>pdfmake 0.2.2</code> to work around security issues in older version.</li>
<li>Upgrading to <code>xlsx 0.17.0</code> to work around security issues in older version.</li>
</ul>
<h3>Fixed</h3>
<ul>
<li>In some cases axis labels could be hidden across multiple data updates.</li>
<li>Fixed issue with stacked/clustered negative values.</li>
<li><code>MapChart</code> now respects <code>home*</code> zoom/position with externally loaded geodata.</li>
<li>Sizing/positioning of 3D charts with titles fixed.</li>
<li>RangeSelector plugin: fixed zoom range resetting issues.</li>
<li>Issue with inverted radial axis fixed.</li>
<li>Axis with <code>snapToSeries</code> set was snapping to hidden series.</li>
<li>Using timezone was causing <code>DateAxis</code> tooltips to show incorrect time in some cases.</li>
<li>Issue with label text with a lot of in-line formatting not wrapping properly fixed.cd dis</li>
</ul>
<h2>4.10.20</h2>
<h2>[4.10.20] - 2021-06-17</h2>
<h3>Fixed</h3>
<ul>
<li>In-line formatting of labels was triggering errors on pages with strict CSP rules.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/amcharts/amcharts4/commit/d542633d312b57484b3a45237e7486c265b6fe9c"><code>d542633</code></a> Version 4.10.21</li>
<li><a href="https://github.com/amcharts/amcharts4/commit/d917386641ddcf317fac95415e7e901984de6c59"><code>d917386</code></a> Version 4.10.20</li>
<li>See full diff in <a href="https://github.com/amcharts/amcharts4/compare/4.10.19...4.10.21">compare view</a></li>
</ul>
</details>
<br />


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</details>

yarn.lock

@@ -3,9 +3,9 @@
 
 
 "@amcharts/amcharts4@^4.9.12":
-  version "4.10.19"
-  resolved "https://registry.yarnpkg.com/@amcharts/amcharts4/-/amcharts4-4.10.19.tgz#e47a63ba0fdbe00d27108af35e1d66db43bdbc02"
-  integrity sha512-O0SgjYkSzzrM+ZobE61BLIaoVbcUAQ0IuPuvXBHWdRTLhVnJDSsPIR6+dZZp5t2E7o4yKNRr5RzFiwDM+ASz9Q==
+  version "4.10.21"
+  resolved "https://registry.yarnpkg.com/@amcharts/amcharts4/-/amcharts4-4.10.21.tgz#1c32b7300fb97c1cb9a5ef65ca8012ca9d2e2da5"
+  integrity sha512-UD2FXYLwgRU7znERAH3ge3S5YKEA1Hs+HkqZHAsf1tLt3gUCS+sfY2aiL3bfJA0JHhUAPR0BsBmd3unxTgctvQ==
   dependencies:
     "@babel/runtime" "^7.6.3"
     core-js "^3.0.0"