Update Microsoft.VisualStudio.Threading.Analyzers to latest (#7091)

Author: stephentoub

eng/packages/General.props

@@ -44,7 +44,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageVersion Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.10.48" />
+    <PackageVersion Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.14.15" />
     <PackageVersion Include="ReferenceTrimmer" Version="3.3.1" />
     <PackageVersion Include="SonarAnalyzer.CSharp" Version="8.56.0.67649" />
     <PackageVersion Include="StyleCop.Analyzers.Unstable" Version="1.2.0.556" />

src/Libraries/Microsoft.Extensions.Hosting.Testing/FakeHost.cs

@@ -118,7 +118,9 @@ public void Dispose()
 
         _disposed = true;
 
-        StopAsync().ConfigureAwait(false).GetAwaiter().GetResult();
+#pragma warning disable VSTHRD002 // Avoid problematic synchronous waits
+        StopAsync().GetAwaiter().GetResult();
+#pragma warning restore VSTHRD002
         _host.Dispose();
     }
 }