update exclude list on results of 21.0.5_b738.27 test runs

test/jdk/jbA11yProblemList.txt

@@ -128,6 +128,7 @@ java/awt/Choice/ChoicePopupLocation/ChoicePopupLocation.java JBR-6857,JBR-5505 m
 java/awt/Choice/NonFocusablePopupMenuTest.java JBR-7961 windows-x64
 java/awt/Choice/RemoveAllShrinkTest/RemoveAllShrinkTest.java JBR-5510,8310487,JBR-6950 linux-5.18.2-arch1-1,linux-all,windows-x64
 java/awt/Choice/ResizeAutoClosesChoice/ResizeAutoClosesChoice.java JBR-5510,JBR-5905 linux-5.18.2-arch1-1,linux-all,windows-x64
+java/awt/ColorClass/AlphaColorTest.java JBR-7253 windows-x64
 java/awt/Component/NativeInLightShow/NativeInLightShow.java JBR-7715 windows-x64
 java/awt/Component/RepaintTest.java JBR-7754 windows-x64
 java/awt/datatransfer/DragUnicodeBetweenJVMTest/DragUnicodeBetweenJVMTest.java JBR-5538 windows-x64