feat(deps): bump MvvmCross.Plugin.Sidebar (#567)

Bumps [MvvmCross.Plugin.Sidebar](https://github.com/MvvmCross/MvvmCross) from 6.3.1 to 6.4.0.
- [Release notes](https://github.com/MvvmCross/MvvmCross/releases)
- [Changelog](https://github.com/MvvmCross/MvvmCross/blob/develop/CHANGELOG.md)
- [Commits](MvvmCross/MvvmCross@6.3.1...6.4.0)

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

src/Templates/MvxNative/NavigationMenu/src/MvxNative.iOS/MvxNative.iOS.csproj

@@ -159,7 +159,7 @@
       <Version>6.3.1</Version>
     </PackageReference>
     <PackageReference Include="MvvmCross.Plugin.Sidebar">
-      <Version>6.3.1</Version>
+      <Version>6.4.0</Version>
     </PackageReference>
   </ItemGroup>
   <ItemGroup>