Moved Color.Mix test into NET10 API block

Author: Avid29

components/Helpers/tests/Test_ColorHelper.cs

@@ -213,13 +213,6 @@ public void Test_ColorHelper_AlphaOver()
         Assert.AreEqual(Colors.Red.AlphaOver(Colors.Blue, 0.5), Color.FromArgb(255, 128, 0, 128));
     }
 
-    [TestCategory("Helpers")]
-    [TestMethod]
-    public void Test_ColorHelper_Mix()
-    {
-        Assert.AreEqual(Color.Mix(Colors.White, Colors.Black, 0.6625), Colors.DarkGray);
-    }
-
     [TestCategory("Helpers")]
     [TestMethod]
     public void Test_ColorHelper_WithHue()
@@ -250,6 +243,13 @@ public void Test_ColorHelper_WithLightness()
 
 #if NET10_0_OR_GREATER
 
+    [TestCategory("Helpers")]
+    [TestMethod]
+    public void Test_ColorHelper_Mix()
+    {
+        Assert.AreEqual(Color.Mix(Colors.White, Colors.Black, 0.6625), Colors.DarkGray);
+    }
+
     [TestCategory("Helpers")]
     [TestMethod]
     public void Test_ColorHelper_Add()