Fix prototype code to address CodeQL (#5472)

Author: bgavrilMS

prototype/KeyGuardMaa/KeyGuardDemo.csproj

@@ -2,14 +2,16 @@
 
 	<PropertyGroup>
 		<OutputType>Exe</OutputType>
-		<TargetFramework>net8.0-windows</TargetFramework>
+		<TargetFramework>net8.0</TargetFramework>
 		<PlatformTarget>x64</PlatformTarget>
 
 		<RuntimeIdentifier>win-x64</RuntimeIdentifier>
 		<EnableNativeCopyLocalItems>true</EnableNativeCopyLocalItems>
 
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
+
+    <ManagePackageVersionsCentrally>false</ManagePackageVersionsCentrally>
 	</PropertyGroup>
 
 	<!-- managed packages -->

prototype/KeyGuardMaa/Program.cs

@@ -86,7 +86,7 @@ static void Main()
             byte[] sig = rsa.SignData(
                 System.Text.Encoding.UTF8.GetBytes("Hello KeyGuard"),
                 HashAlgorithmName.SHA256,
-                RSASignaturePadding.PSS);
+                RSASignaturePadding.Pss);
 
             Console.WriteLine($"\nSignature length: {sig.Length} bytes");
         }