Update System.Diagnostics.Process Xunit helpers

Assert.None no longer exists, so use Assert.DoesNotContain instead, which
is equivalent.

Author: mellinoe

src/Common/tests/System/Diagnostics/AssertWithCallerAttributes.cs

@@ -277,21 +277,21 @@ public static T IsType<T>(object @object,
     public static void None(IEnumerable collection, object expected,
         [CallerFilePath] string path = null, [CallerLineNumber] int line = 0)
     {
-        try { Xunit.Assert.None(collection, expected); }
+        try { Xunit.Assert.DoesNotContain(expected, (IEnumerable<object>)collection); }
         catch (Exception e) { throw WrapException(e, path, line); }
     }
 
-    public static void None<T>(IEnumerable<T> collection, Func<T, bool> predicate,
+    public static void None<T>(IEnumerable<T> collection, Predicate<T> predicate,
         [CallerFilePath] string path = null, [CallerLineNumber] int line = 0)
     {
-        try { Xunit.Assert.None(collection, predicate); }
+        try { Xunit.Assert.DoesNotContain(collection, predicate); }
         catch (Exception e) { throw WrapException(e, path, line); }
     }
 
     public static void None<T>(IEnumerable<T> collection, T expected,
         [CallerFilePath] string path = null, [CallerLineNumber] int line = 0)
     {
-        try { Xunit.Assert.None(collection, expected); }
+        try { Xunit.Assert.DoesNotContain(expected, collection); }
         catch (Exception e) { throw WrapException(e, path, line); }
     }