Bump fl_chart from 0.67.0 to 0.68.0 in /experimental/pedometer/example (#2272)

Bumps [fl_chart](https://github.com/imaNNeo/fl_chart) from 0.67.0 to 0.68.0.
<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>0.68.0</h2>
<ul>
<li><strong>Improvement</strong> (by <a href="https://github.com/imaNNeo"><code>@​imaNNeo</code></a>) Update LineChartSample6 to implement a way to show a tooltip on a single spot, <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1620">#1620</a></li>
<li><strong>Feature</strong> (by <a href="https://github.com/herna"><code>@​herna</code></a>) Add <code>titleSunbeamLayout</code> inside the <a href="https://github.com/imaNNeo/fl_chart/blob/main/repo_files/documentations/bar_chart.md#barchartdata">BarChartData</a> to allow the user to customize the layout of the title sunbeam</li>
<li><strong>Improvement</strong> (by <a href="https://github.com/imaNNeo"><code>@​imaNNeo</code></a>) Add LineChart and BarChart explanation videos on top of the respective documentation pages (<a href="https://youtu.be/F3wTxTdAFaU?si=8lwlypKjt-0aJJK0">LineChart video</a>, <a href="https://youtu.be/vYe0RY1nCAA?si=30q_7eNn9MDLcph4">BarChart video</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/imaNNeo/fl_chart/blob/main/CHANGELOG.md">fl_chart's changelog</a>.</em></p>
<blockquote>
<h2>0.68.0</h2>
<ul>
<li><strong>Improvement</strong> (by <a href="https://github.com/imaNNeo"><code>@​imaNNeo</code></a>) Update LineChartSample6 to implement a way to show a tooltip on a single spot, <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1620">#1620</a></li>
<li><strong>Feature</strong> (by <a href="https://github.com/herna"><code>@​herna</code></a>) Add <code>titleSunbeamLayout</code> inside the <a href="https://github.com/imaNNeo/fl_chart/blob/main/repo_files/documentations/bar_chart.md#barchartdata">BarChartData</a> to allow the user to customize the layout of the title sunbeam</li>
<li><strong>Improvement</strong> (by <a href="https://github.com/imaNNeo"><code>@​imaNNeo</code></a>) Add LineChart and BarChart explanation videos on top of the respective documentation pages (<a href="https://youtu.be/F3wTxTdAFaU?si=8lwlypKjt-0aJJK0">LineChart video</a>, <a href="https://youtu.be/vYe0RY1nCAA?si=30q_7eNn9MDLcph4">BarChart video</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="2ecde9a40d"><code>2ecde9a</code></a> Bump version to 0.68.0</li>
<li><a href="19cf5c8f19"><code>19cf5c8</code></a> Update CHANGELOG.md</li>
<li><a href="5a0bebc04b"><code>5a0bebc</code></a> Documentation for new property PieCharData.titleSunbeamLayout</li>
<li><a href="734d737c6b"><code>734d737</code></a> Duplicated test removed</li>
<li><a href="8ef1f5b33f"><code>8ef1f5b</code></a> Upper limit fix to show titles with &quot;titleSunbeamLayout&quot;. Unit tests.</li>
<li><a href="98e6fe6059"><code>98e6fe6</code></a> New property PieChartData.titleSunbeamLayout to rotate the titles of each sec...</li>
<li><a href="df2788e72a"><code>df2788e</code></a> Update LineChartSample6 to implement a way to show a tooltip on a single spot...</li>
<li><a href="3ea5ac86bb"><code>3ea5ac8</code></a> Update bar_chart.md to add the video</li>
<li><a href="8c5848d9fb"><code>8c5848d</code></a> Improve the showingTooltipIndicators documentation to mention that you have t...</li>
<li><a href="ef72300af9"><code>ef72300</code></a> Fix equality check for FlSpot.null() values, <a href="https://redirect.github.com/imaNNeo/fl_chart/issues/1607">#1607</a></li>
<li>Additional commits viewable in <a href="https://github.com/imaNNeo/fl_chart/compare/0.67.0...0.68.0">compare view</a></li>
</ul>
</details>
<br />

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</details>

experimental/pedometer/example/pubspec.yaml

@@ -42,7 +42,7 @@ dependencies:
   ffi: ^2.1.2
   intl: ^0.19.0
   jni: ^0.9.0
-  fl_chart: ^0.67.0
+  fl_chart: ^0.68.0
 
 dev_dependencies:
   flutter_test: