Include new border value

Author: Hector Arce De Las Heras

src/designSystem/kubit/foundations/borders.ts

@@ -9,6 +9,7 @@ export const RADIUS = {
   radius_00: '0rem', // 0px
   radius_25: '0.13 rem', // 2px
   radius_50: '0.25rem', // 4px
+  radius_75: '0.5rem', // 8px
   radius_100: '6.25rem', // 100px
   radius_circle: '50%',
 };