Bump fl_chart from 0.63.0 to 0.64.0 in /experimental/pedometer/example (#2039)

Bumps [fl_chart](https://github.com/imaNNeo/fl_chart) from 0.63.0 to 0.64.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/imaNNeo/fl_chart/releases">fl_chart's releases</a>.</em></p>
<blockquote>
<h2>0.64.0</h2>
<ul>
<li><strong>BUGFIX</strong> (by <a href="https://github.com/Anas35"><code>@​Anas35</code></a>) Fix Tooltip not displaying when value from BackgroundBarChartRodData is less than zero. <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1345">#1345</a>.</li>
<li><strong>BUGFIX</strong> (by <a href="https://github.com/imaNNeo"><code>@​imaNNeo</code></a>) Fix Negative BarChartRodStackItem are not drawn correctly bug, <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1347">#1347</a></li>
<li><strong>BUGFIX</strong> (by <a href="https://github.com/imaNNeo"><code>@​imaNNeo</code></a>) Fix bar_chart_helper minY calculation bug, <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1388">#1388</a></li>
<li><strong>IMPROVEMENT</strong> (by <a href="https://github.com/imaNNeo"><code>@​imaNNeo</code></a>) Consider fraction digits when formatting chart side titles, <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1267">#1267</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/imaNNeo/fl_chart/blob/master/CHANGELOG.md">fl_chart's changelog</a>.</em></p>
<blockquote>
<h2>0.64.0</h2>
<ul>
<li><strong>BUGFIX</strong> (by <a href="https://github.com/Anas35"><code>@​Anas35</code></a>) Fix Tooltip not displaying when value from BackgroundBarChartRodData is less than zero. <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1345">#1345</a>.</li>
<li><strong>BUGFIX</strong> (by <a href="https://github.com/imaNNeo"><code>@​imaNNeo</code></a>) Fix Negative BarChartRodStackItem are not drawn correctly bug, <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1347">#1347</a></li>
<li><strong>BUGFIX</strong> (by <a href="https://github.com/imaNNeo"><code>@​imaNNeo</code></a>) Fix bar_chart_helper minY calculation bug, <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1388">#1388</a></li>
<li><strong>IMPROVEMENT</strong> (by <a href="https://github.com/imaNNeo"><code>@​imaNNeo</code></a>) Consider fraction digits when formatting chart side titles, <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1267">#1267</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="633c40d692"><code>633c40d</code></a> Bump version to 0.64.0</li>
<li><a href="621b79e82d"><code>621b79e</code></a> Update CHANGELOG.md</li>
<li><a href="cb51189fc2"><code>cb51189</code></a> Consider fraction digits when formatting chart side titles, <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1267">#1267</a></li>
<li><a href="ce49b92e1a"><code>ce49b92</code></a> Fix donation link in README.md file</li>
<li><a href="4c6d2b34c3"><code>4c6d2b3</code></a> chore: bump actions/checkout from 2 to 4</li>
<li><a href="04b18d2242"><code>04b18d2</code></a> Update CHANGELOG.md</li>
<li><a href="eeb1ba4204"><code>eeb1ba4</code></a> Fix bar_chart_helper minY calculation bug, <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1388">#1388</a></li>
<li><a href="5d81d616c9"><code>5d81d61</code></a> Use <code>dart format</code> instead of <code>flutter format</code> (deprecated).</li>
<li><a href="dd479e0e31"><code>dd479e0</code></a> Decrease menu items sizes</li>
<li><a href="306989dc60"><code>306989d</code></a> Simplify ChartType enum</li>
<li>Additional commits viewable in <a href="https://github.com/imaNNeo/fl_chart/compare/0.63.0...0.64.0">compare view</a></li>
</ul>
</details>
<br />

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</details>

experimental/pedometer/example/pubspec.yaml

@@ -45,7 +45,7 @@ dependencies:
   ffi: ^2.0.1
   intl: ^0.18.0
   jni: ^0.7.0
-  fl_chart: ^0.63.0
+  fl_chart: ^0.64.0
 
 dev_dependencies:
   flutter_test: