Update dependency @vueform/slider to v2.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@vueform/slider	2.1.0 -> 2.1.1

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Release Notes

vueform/slider

### [`v2.1.1`](https://togithub.com/vueform/slider/blob/HEAD/CHANGELOG.md#v211) [Compare Source](https://togithub.com/vueform/slider/compare/2.1.0...2.1.1) > `2022-07-11` ##### 🎉 Features - Vue.js `2.7` compatibility

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