Update dependency flickity to v2.2.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
flickity	dependencies	minor	2.1.2 -> 2.2.0	homepage, source

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Release Notes

metafizzy/flickity

### [`v2.2.0`](https://togithub.com/metafizzy/flickity/releases/v2.2.0) [Compare Source](https://togithub.com/metafizzy/flickity/compare/v2.1.2...v2.2.0) - 🔔 Add `fade` option. Only took 4 years 🎉 [#​26](https://togithub.com/metafizzy/flickity/issues/26) - 🔔 Add `initialIndex: '.selector'` option setting. [#​818](https://togithub.com/metafizzy/flickity/issues/818) [#​881](https://togithub.com/metafizzy/flickity/issues/881) - 🛠 Improve accessibility, use `aria-hidden` instead of `aria-seletected`. [#​774](https://togithub.com/metafizzy/flickity/issues/774) - 🛠 Remove `tap-listener` package. [#​764](https://togithub.com/metafizzy/flickity/issues/764) - 🐞 Fix events triggering after `destroy`. [#​482](https://togithub.com/metafizzy/flickity/issues/482) - 🐞 Fix iOS 9 dragging. [#​779](https://togithub.com/metafizzy/flickity/issues/779) - 🎨 use `currentColor` CSS. [#​865](https://togithub.com/metafizzy/flickity/issues/865)

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