Update dependency System.Memory to 4.6.0

Author: renovate[bot]

Directory.Packages.props

@@ -34,7 +34,7 @@
     <PackageVersion Include="Microsoft.Windows.CsWin32" Version="0.3.106" />
     <PackageVersion Include="Nullable" Version="1.3.1" />
     <PackageVersion Include="System.Collections.Immutable" Version="6.0.0" />
-    <PackageVersion Include="System.Memory" Version="4.5.5" />
+    <PackageVersion Include="System.Memory" Version="4.6.0" />
     <PackageVersion Include="System.Runtime.CompilerServices.Unsafe" Version="6.1.0" />
     <PackageVersion Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
     <PackageVersion Include="System.ValueTuple" Version="4.5.0" />