Bump styled-system from 4.2.4 to 5.1.5

Bumps [styled-system](https://github.com/jxnblk/styled-system) from 4.2.4 to 5.1.5. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/styled-system/styled-system/blob/master/CHANGELOG.md">styled-system's changelog</a>.</em></p> <blockquote> <h2>v5.1.5 2020-02-17</h2> <ul> <li><code>@styled-system/css</code> fix media query order <a href="https://redirect.github.com/jxnblk/styled-system/issues/1137">#1137</a></li> <li>Update dependencies</li> </ul> <h2>v5.1.4 2019-12-02</h2> <ul> <li><code>@styled-system/css</code> add <code>outlineColor</code> support <a href="https://redirect.github.com/jxnblk/styled-system/issues/825">#825</a></li> <li>Update dependencies</li> </ul> <h2>v5.1.3 2019-09-16</h2> <ul> <li>Add <code>@styled-system/props</code> utility <a href="https://redirect.github.com/jxnblk/styled-system/issues/824">#824</a></li> </ul> <h2>v5.1.2 2019-09-11</h2> <ul> <li>Update dependencies</li> <li>Fix sort for media queries in plain object syntax <a href="https://redirect.github.com/jxnblk/styled-system/issues/812">#812</a></li> </ul> <h2>v5.1.1 2019-08-22</h2> <ul> <li>Fix for passing props through to transform function <a href="https://redirect.github.com/jxnblk/styled-system/issues/723">#723</a></li> <li>Update dependencies</li> </ul> <h2>v5.1.0 2019-08-12</h2> <ul> <li>New <code>variant</code> API with support for inline variant definitions and theme-based style objects <a href="https://redirect.github.com/jxnblk/styled-system/issues/699">#699</a></li> </ul> <h2>v5.0.23 2019-08-12</h2> <ul> <li>Add support for <code>overflowX</code> and <code>overflowY</code> <a href="https://redirect.github.com/jxnblk/styled-system/issues/682">#682</a></li> <li><code>@styled-system/css</code>: add support for <code>size</code> <a href="https://redirect.github.com/jxnblk/styled-system/issues/684">#684</a></li> <li>Update dependencies</li> </ul> <h2>v5.0.22 2019-08-09</h2> <ul> <li><code>@styled-system/css</code>: add support for <code>fill</code>, <code>stroke</code>, and <code>flexBasis</code> <a href="https://redirect.github.com/jxnblk/styled-system/issues/679">#679</a></li> </ul> <h2>v5.0.21 2019-08-07</h2> <ul> <li>Fix publish</li> </ul> <h2>v5.0.20 2019-08-07</h2> <ul> <li>Add theme support for more border properties <a href="https://redirect.github.com/jxnblk/styled-system/issues/670">#670</a> &amp; <a href="https://redirect.github.com/jxnblk/styled-system/issues/671">#671</a></li> </ul> <h2>v5.0.19 2019-08-05</h2> <ul> <li><code>@styled-system/css</code> allow functional values to return responsive array values <a href="https://redirect.github.com/jxnblk/styled-system/issues/654">#654</a></li> </ul> <!-- raw HTML omitted --> </blockquote> <p>... (truncated)</p> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/styled-system/styled-system/commit/629fa1a080fb71c0f966c79539aa4c5fd92f2f74"><code>629fa1a</code></a> v5.1.5</li> <li><a href="https://github.com/styled-system/styled-system/commit/d5ed7c61e828452959767e04f426242ef1655b16"><code>d5ed7c6</code></a> Edit changelog</li> <li><a href="https://github.com/styled-system/styled-system/commit/50fcdad99b588237ed131a03d389ad8e4fb650f0"><code>50fcdad</code></a> Merge pull request <a href="https://redirect.github.com/jxnblk/styled-system/issues/1137">#1137</a> from RyanTheAllmighty/fix-responsive-null-styling</li> <li><a href="https://github.com/styled-system/styled-system/commit/d8d24838187468e0760fafaba74ea252a6738dca"><code>d8d2483</code></a> Merge pull request <a href="https://redirect.github.com/jxnblk/styled-system/issues/1139">#1139</a> from styled-system/dependabot/npm_and_yarn/react-scr...</li> <li><a href="https://github.com/styled-system/styled-system/commit/841d2c27767dc496414446cfc3feb972d70539d3"><code>841d2c2</code></a> Merge pull request <a href="https://redirect.github.com/jxnblk/styled-system/issues/1144">#1144</a> from styled-system/dependabot/npm_and_yarn/rollup-1....</li> <li><a href="https://github.com/styled-system/styled-system/commit/9750f7615d21442d9087b3a094aeca2e61f3f688"><code>9750f76</code></a> Merge pull request <a href="https://redirect.github.com/jxnblk/styled-system/issues/1143">#1143</a> from styled-system/dependabot/npm_and_yarn/gatsby-pl...</li> <li><a href="https://github.com/styled-system/styled-system/commit/62c231b6ca060b7efbaf41d21fccdb800b947c52"><code>62c231b</code></a> Merge pull request <a href="https://redirect.github.com/jxnblk/styled-system/issues/1141">#1141</a> from styled-system/dependabot/npm_and_yarn/gatsby-2....</li> <li><a href="https://github.com/styled-system/styled-system/commit/1ea4ca76ff967a4381109d53547dbc5102f1c788"><code>1ea4ca7</code></a> Merge pull request <a href="https://redirect.github.com/jxnblk/styled-system/issues/1142">#1142</a> from styled-system/dependabot/npm_and_yarn/husky-4.2.3</li> <li><a href="https://github.com/styled-system/styled-system/commit/4ee3c01e1e975cdaabbffe8d36edb826b5c0603b"><code>4ee3c01</code></a> Bump rollup from 1.31.0 to 1.31.1</li> <li><a href="https://github.com/styled-system/styled-system/commit/2b722a67bdc6459577a4e9ba3d7c0f1495bcfe69"><code>2b722a6</code></a> Bump gatsby-plugin-mdx from 1.0.70 to 1.0.73</li> <li>Additional commits viewable in <a href="https://github.com/jxnblk/styled-system/compare/styled-system@4.2.4...v5.1.5">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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