chore(deps): update zwave-js-ui to v9.21.1

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
zwave-js/zwave-js-ui	patch	v9.21.0 -> v9.21.1

This PR updates the version of zwave-js-ui in the snapcraft.yaml file to match the latest GitHub release.

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Release Notes

zwave-js/zwave-js-ui (zwave-js/zwave-js-ui)

### [`v9.21.1`](https://redirect.github.com/zwave-js/zwave-js-ui/releases/tag/v9.21.1): Release 9.21.1 [Compare Source](https://redirect.github.com/zwave-js/zwave-js-ui/compare/v9.21.0...v9.21.1) ##### Bug Fixes - **discovery:** correctly handle up/down commands for covers ([#​3916](https://redirect.github.com/zwave-js/zwave-js-ui/issues/3916)) ([1582b2a](https://redirect.github.com/zwave-js/zwave-js-ui/commit/1582b2ad5eabcc9dae21e67257560d42f092f758)) - **ui:** hide dsk codes when streamer mode is enabled ([c0785b7](https://redirect.github.com/zwave-js/zwave-js-ui/commit/c0785b7a970e4cef79e1a3d1613e8ff64e5fe15c)), closes [#​3921](https://redirect.github.com/zwave-js/zwave-js-ui/issues/3921)

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