Upgrade System.Memory to v4.5.2

Author: mythz

src/ServiceStack.OrmLite/ServiceStack.OrmLite.Core.csproj

@@ -14,7 +14,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Memory" Version="4.5.1" />
+    <PackageReference Include="System.Memory" Version="4.5.2" />
     <PackageReference Include="ServiceStack.Common.Core" Version="$(Version)" />
   </ItemGroup>