fix(table): change border color of table header for harsh variant aft…

…er recieving feedback from product designers.

data/tokens/components/table.json

@@ -46,7 +46,7 @@
           },
           "border-default": {
             "$type": "color",
-            "$value": "{modes.color.interactive.monochrome.generic.withDefault}"
+            "$value": "{modes.color.generic.fg.soft}"
           },
           "label-default": {
             "$type": "color",