Bump Microsoft.NETCore.UniversalWindowsPlatform

Bumps [Microsoft.NETCore.UniversalWindowsPlatform](https://github.com/Microsoft/dotnet) from 5.2.3 to 5.2.4.
- [Release notes](https://github.com/Microsoft/dotnet/releases)
- [Commits](https://github.com/Microsoft/dotnet/commits)

---
updated-dependencies:
- dependency-name: Microsoft.NETCore.UniversalWindowsPlatform
  dependency-type: direct:production
...

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OxyPlot/Source/Examples/Windows/SimpleDemo/SimpleDemo.csproj

@@ -129,7 +129,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform">
-      <Version>5.2.3</Version>
+      <Version>5.2.4</Version>
     </PackageReference>
   </ItemGroup>
   <ItemGroup>

OxyPlot/Source/OxyPlot.Windows/OxyPlot.Windows.csproj

@@ -127,7 +127,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform">
-      <Version>5.2.3</Version>
+      <Version>5.2.4</Version>
     </PackageReference>
   </ItemGroup>
   <ItemGroup>