Enable nullable: System.Management.Automation.IDynamicParameters (#14153)

src/System.Management.Automation/engine/MshCmdlet.cs

@@ -14,6 +14,7 @@ using PipelineResultTypes = System.Management.Automation.Runspaces.PipelineResul
 namespace System.Management.Automation
 {
     #region Auxiliary
+
     /// <summary>
     /// An interface that a
     /// <see cref="Cmdlet"/> or <see cref="Provider.CmdletProvider"/>
@@ -31,6 +32,7 @@ namespace System.Management.Automation
     /// <seealso cref="PSCmdlet"/>
     /// <seealso cref="RuntimeDefinedParameter"/>
     /// <seealso cref="RuntimeDefinedParameterDictionary"/>
+#nullable enable
     public interface IDynamicParameters
     {
         /// <summary>
@@ -62,8 +64,10 @@ namespace System.Management.Automation
         /// may not be set at the time this method is called,
         /// even if the parameters are mandatory.
         /// </returns>
-        object GetDynamicParameters();
+        object? GetDynamicParameters();
     }
+#nullable restore
+
     /// <summary>
     /// Type used to define a parameter on a cmdlet script of function that
     /// can only be used as a switch.