Bump tar from 4.4.8 to 4.4.19 in /examples/canvas_webgl_minimal/www
Bumps [tar](https://github.com/npm/node-tar) from 4.4.8 to 4.4.19.
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<summary>Commits</summary>
<ul>
<li><a href="9a6faa017c"><code>9a6faa0</code></a> 4.4.19</li>
<li><a href="70ef812593"><code>70ef812</code></a> drop dirCache for symlink on all platforms</li>
<li><a href="3e35515c09"><code>3e35515</code></a> 4.4.18</li>
<li><a href="52b09e309b"><code>52b09e3</code></a> fix: prevent path escape using drive-relative paths</li>
<li><a href="bb93ba2437"><code>bb93ba2</code></a> fix: reserve paths properly for unicode, windows</li>
<li><a href="2f1bca0272"><code>2f1bca0</code></a> fix: prune dirCache properly for unicode, windows</li>
<li><a href="9bf70a8cf7"><code>9bf70a8</code></a> 4.4.17</li>
<li><a href="6aafff0a86"><code>6aafff0</code></a> fix: skip extract if linkpath is stripped entirely</li>
<li><a href="5c5059a69c"><code>5c5059a</code></a> fix: reserve paths case-insensitively</li>
<li><a href="fd6accba69"><code>fd6accb</code></a> 4.4.16</li>
<li>Additional commits viewable in <a href="https://github.com/npm/node-tar/compare/v4.4.8...v4.4.19">compare view</a></li>
</ul>
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