fix(VDatePickerControls): wrong icon types (#20121)

Author: michalzaq12

packages/vuetify/src/components/VDatePicker/VDatePickerControls.tsx

@@ -5,6 +5,9 @@ import './VDatePickerControls.sass'
 import { VBtn } from '@/components/VBtn'
 import { VSpacer } from '@/components/VGrid'
 
+// Composables
+import { IconValue } from '@/composables/icons'
+
 // Utilities
 import { computed } from 'vue'
 import { genericComponent, propsFactory, useRender } from '@/util'
@@ -22,15 +25,15 @@ export const makeVDatePickerControlsProps = propsFactory({
     default: false,
   },
   nextIcon: {
-    type: [String],
+    type: IconValue,
     default: '$next',
   },
   prevIcon: {
-    type: [String],
+    type: IconValue,
     default: '$prev',
   },
   modeIcon: {
-    type: [String],
+    type: IconValue,
     default: '$subgroup',
   },
   text: String,