[release/7.0.3xx] Update the msbuild version to a version that includ…

…es additional fixes (#39830)

NuGet.config

@@ -29,6 +29,7 @@
     <add key="dotnet-libraries" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-libraries/nuget/v3/index.json" />
     <add key="dotnet-libraries-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-libraries-transport/nuget/v3/index.json" />
     <add key="vs-impl" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/vs-impl/nuget/v3/index.json" />
+    <add key="darc-pub-DotNet-msbuild-Trusted-6918b86" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-DotNet-msbuild-Trusted-6918b863/nuget/v3/index.json" />   <!-- Used for Rich Navigation indexing task -->
     <!-- Used for Rich Navigation indexing task -->
     <add key="richnav" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/vs-buildservices/nuget/v3/index.json" />
   </packageSources>

eng/Versions.props

@@ -112,7 +112,7 @@
           so target one that matches the version in minimumMSBuildVersion.
 
           This avoids the need to juggle references to packages that have been updated in newer MSBuild. -->
-    <MicrosoftBuildPackageVersion Condition="exists('$(RepoRoot)\src\Layout\redist\minimumMSBuildVersion') and '$(DotNetBuildFromSource)' != 'true'">$([System.IO.File]::ReadAllText('$(RepoRoot)\src\Layout\redist\minimumMSBuildVersion').Trim())</MicrosoftBuildPackageVersion>
+    <MicrosoftBuildPackageVersion Condition="'$(DotNetBuildFromSource)' != 'true'">17.4.8</MicrosoftBuildPackageVersion>
     <MicrosoftBuildFrameworkPackageVersion>$(MicrosoftBuildPackageVersion)</MicrosoftBuildFrameworkPackageVersion>
     <MicrosoftBuildRuntimePackageVersion>$(MicrosoftBuildPackageVersion)</MicrosoftBuildRuntimePackageVersion>
     <MicrosoftBuildLocalizationPackageVersion>17.6.10-preview-23329-03</MicrosoftBuildLocalizationPackageVersion>