Update dependency @prezly/sdk to v21.2.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@prezly/sdk	21.1.2 -> 21.2.0

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Release Notes

prezly/javascript-sdk (@​prezly/sdk)

### [`v21.2.0`](https://togithub.com/prezly/javascript-sdk/releases/tag/v21.2.0) [Compare Source](https://togithub.com/prezly/javascript-sdk/compare/v21.1.2...v21.2.0) ##### What's Changed - \[CARE-5115] Add contact last_contacted_at and delivered properties by [@​marko-ogg](https://togithub.com/marko-ogg) in [https://github.com/prezly/javascript-sdk/pull/295](https://togithub.com/prezly/javascript-sdk/pull/295) **Full Changelog**: https://github.com/prezly/javascript-sdk/compare/v21.1.2...v21.2.0

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Configuration

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