feat(vue): allow vue 2.7

[dargmuesli]

Summary

Resolves #2560

Set of changes

• urql/vue peer dependency set to allow Vue 2.7 in addition to Vue 3

[changeset-bot]

🦋 Changeset detected

Latest commit: 9d1222e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@urql/vue	Patch

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[kitten]

This is fantastic news! Also love the Naruto reference, haha 😄
I don't have enough bandwidth to test whether this is working as intended, but I'd assume that we'll get enough information from publishing this and finding out that way ✌️

Edit: I had a quick read. My prior assumption was that Vue 3's reactivity framework is pretty portable, so I don't expect problems there. I suppose the only feature that won't work is the async setup initialisation i.e. Vue Suspense, which is not our tradeoff to make, so our API will work just as well as can be expected, I guess 👍

[dargmuesli]

Yes, indeed. Just saw the note in the readme: https://github.com/FormidableLabs/urql/blob/70a149ed15370154541d9bbd260ddf62b5e3ffb1/packages/vue-urql/README.md?plain=1#L25
That could be changed to indicate Vue 2.7 support too, of course.

---

For anyone coming here in a future google, this is the shortened way I added urql as Nuxt bridge plugin:

import { createClient } from '@urql/core'
import { provideClient } from '@urql/vue'
import { defineNuxtPlugin, useNuxtApp } from '#app'

export default defineNuxtPlugin((nuxt) => {
  const client = createClient({
    url: '...'
  })
  nuxt.provide('urql', client)
  nuxt.hook('vue:setup', () => {
    const { $urql } = useNuxtApp()
    provideClient($urql)
  })
})