LibWeb: Add list-style-type: upper-latin and upper-alpha support

Author: https://github.com/TobyAsE
Commit: 889e1d3db9
Pull-request: https://github.com/SerenityOS/serenity/pull/6568
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/CSS/StyleValue.h

@@ -162,6 +162,8 @@ enum class ListStyleType {
     DecimalLeadingZero,
     LowerAlpha,
     LowerLatin,
+    UpperAlpha,
+    UpperLatin,
 };
 
 enum class Overflow : u8 {