[Improvement] improve computed return type

# Question

I think `ComputedRef<Record<string, string>>` is better than `any`.

[https://github.com/megasanjay/vue3-marquee/blob/main/packages/vue3-marquee/src/vue3-marquee.vue#L382](https://github.com/megasanjay/vue3-marquee/blob/main/packages/vue3-marquee/src/vue3-marquee.vue#L382)

If you think so, I am pleased to submit a pr.
