Bump version numbers and update PackageShader.MsBuild

Updated the project version to 28.0.0-beta.25 in Directory.Build.props and upgraded PackageShader.MsBuild from 0.1.11 to 0.1.13 in Directory.Packages.props.

Author: SimonCropp

src/Directory.Build.props

@@ -2,7 +2,7 @@
 <Project>
   <PropertyGroup>
     <NoWarn>CS1591;NU1608;NU1109</NoWarn>
-    <Version>28.0.0-beta.24</Version>
+    <Version>28.0.0-beta.25</Version>
     <LangVersion>preview</LangVersion>
     <AssemblyVersion>1.0.0</AssemblyVersion>
     <PackageTags>Markdown, Snippets, mdsnippets, documentation, MarkdownSnippets</PackageTags>

src/Directory.Packages.props

@@ -9,7 +9,7 @@
     <PackageVersion Include="Microsoft.Build.Tasks.Core" Version="18.0.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageVersion Include="Microsoft.Sbom.Targets" Version="4.1.5" />
-    <PackageVersion Include="PackageShader.MsBuild" Version="0.1.11" />
+    <PackageVersion Include="PackageShader.MsBuild" Version="0.1.13" />
     <PackageVersion Include="Polyfill" Version="9.7.6" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.170" />
     <PackageVersion Include="ProjectFiles" Version="0.4.0" />