fix(VFileUpload): change uploaded item key for rendering

[SonTT19]

Description

fix #21772

Markup:

<template>
  <v-app>
    <v-container>
      <v-file-upload multiple>
        <template #item="{ file, props }">
          <v-chip closable @click:close="props['onClick:remove']">
            {{ file.name }}
          </v-chip>
        </template>
      </v-file-upload>
    </v-container>
  </v-app>
</template>

<script setup>
  import { ref } from 'vue'

  const msg = ref('Hello World!')
</script>

[J-Sek]

It helps, but there is a possibility to have a duplicate name when using webkitdirectory. So when I have those items next to each other, single click removes both.

Annoying that v-chip removes "itself" and this is what might be the root cause of the problem here.
Commenting out VChip.tsx:151 just fixes it all.