fix#375 - updated schema rule count in the unit test

Author: senthilkumarmohan

test/Microsoft.OpenApi.Tests/Validations/ValidationRuleSetTests.cs

@@ -43,7 +43,7 @@ public void DefaultRuleSetPropertyReturnsTheCorrectRules()
             Assert.NotEmpty(rules);
 
             // Update the number if you add new default rule(s).
-            Assert.Equal(22, rules.Count);
+            Assert.Equal(24, rules.Count);
         }
     }
 }