Make SniNativeMethod implementations sealed

Author: benrr101

src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniNativeMethodsArm64.netfx.cs

@@ -11,7 +11,7 @@
 
 namespace Interop.Windows.Sni
 {
-    internal class SniNativeMethodsArm64 : ISniNativeMethods
+    internal sealed class SniNativeMethodsArm64 : ISniNativeMethods
     {
         private const string DllName = "Microsoft.Data.SqlClient.SNI.arm64.dll";
 

src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniNativeMethodsNotSupported.netfx.cs

@@ -12,7 +12,7 @@
 
 namespace Interop.Windows.Sni
 {
-    internal class SniNativeMethodsNotSupported : ISniNativeMethods
+    internal sealed class SniNativeMethodsNotSupported : ISniNativeMethods
     {
         private readonly string _architecture;
 

src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniNativeMethodsX64.netfx.cs

@@ -11,7 +11,7 @@
 
 namespace Interop.Windows.Sni
 {
-    internal class SniNativeMethodsX64 : ISniNativeMethods
+    internal sealed class SniNativeMethodsX64 : ISniNativeMethods
     {
         private const string DllName = "Microsoft.Data.SqlClient.SNI.x64.dll";
 

src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniNativeMethodsX86.netfx.cs

@@ -11,7 +11,7 @@
 
 namespace Interop.Windows.Sni
 {
-    internal class SniNativeMethodsX86 : ISniNativeMethods
+    internal sealed class SniNativeMethodsX86 : ISniNativeMethods
     {
         private const string DllName = "Microsoft.Data.SqlClient.SNI.x86.dll";