build(deps): bump Xamarin.AndroidX.Palette in /Sample (#349)

Bumps [Xamarin.AndroidX.Palette](https://github.com/xamarin/AndroidX) from 1.0.0.6 to 1.0.0.7.
- [Release notes](https://github.com/xamarin/AndroidX/releases)
- [Commits](https://github.com/xamarin/AndroidX/commits)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Sample/SextantSample.Android/SextantSample.Android.csproj

@@ -75,7 +75,7 @@
     <PackageReference Include="Xamarin.Android.Support.v7.MediaRouter" Version="28.0.0.3" />
     <PackageReference Include="ReactiveUI.XamForms" Version="13.*" />
     <PackageReference Include="Xamarin.AndroidX.MediaRouter" Version="1.2.2" />
-    <PackageReference Include="Xamarin.AndroidX.Palette" Version="1.0.0.6" />    
+    <PackageReference Include="Xamarin.AndroidX.Palette" Version="1.0.0.7" />    
   </ItemGroup>
   <ItemGroup>
     <Compile Include="MainActivity.cs" />