Update dependency System.Threading.Tasks.Extensions to 4.6.0

Author: renovate[bot]

Directory.Packages.props

@@ -36,7 +36,7 @@
     <PackageVersion Include="System.Collections.Immutable" Version="6.0.0" />
     <PackageVersion Include="System.Memory" Version="4.5.5" />
     <PackageVersion Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
-    <PackageVersion Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
+    <PackageVersion Include="System.Threading.Tasks.Extensions" Version="4.6.0" />
     <PackageVersion Include="System.ValueTuple" Version="4.5.0" />
     <PackageVersion Include="xunit.abstractions" Version="2.0.3" />
     <PackageVersion Include="Xunit.Combinatorial" Version="1.6.24" />