Bump Microsoft.VisualStudio.Threading.Analyzers from 16.7.56 to 16.8.51

Bumps [Microsoft.VisualStudio.Threading.Analyzers](https://github.com/microsoft/vs-threading) from 16.7.56 to 16.8.51.
- [Release notes](https://github.com/microsoft/vs-threading/releases)
- [Commits](https://github.com/microsoft/vs-threading/commits)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

Directory.Build.props

@@ -23,7 +23,7 @@
   <ItemGroup Label="Package References">
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" PrivateAssets="All" Version="3.3.0" />
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" PrivateAssets="All" Version="1.0.0" />
-    <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" PrivateAssets="All" Version="16.7.56" />
+    <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" PrivateAssets="All" Version="16.8.51" />
     <PackageReference Include="MinVer" PrivateAssets="All" Version="2.3.1" />
     <PackageReference Include="StyleCop.Analyzers" PrivateAssets="All" Version="1.1.118" />
   </ItemGroup>