fix: Update font-palette animation type (#716)

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### Description

The animation type of `font-palette` recently changed from discrete to
by computed value. This PR reflects this change in the data. See
https://drafts.csswg.org/css-fonts/#font-palette-prop

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css/properties.json

@@ -4927,7 +4927,7 @@
     "syntax": "normal | light | dark | <palette-identifier>",
     "media": "visual",
     "inherited": true,
-    "animationType": "discrete",
+    "animationType": "byComputedValueType",
     "percentages": "no",
     "groups": [
       "CSS Fonts"