fix(deps): update dependency decky-frontend-lib to v3.21.7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
decky-frontend-lib	3.21.6 -> 3.21.7

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Release Notes

SteamDeckHomebrew/decky-frontend-lib (decky-frontend-lib)

### [`v3.21.7`](https://togithub.com/SteamDeckHomebrew/decky-frontend-lib/blob/HEAD/CHANGELOG.md#​3217-httpsgithubcomSteamDeckHomebrewdecky-frontend-libcomparev3216v3217-2023-06-26) [Compare Source](https://togithub.com/SteamDeckHomebrew/decky-frontend-lib/compare/v3.21.6...v3.21.7) ##### Bug Fixes - add patch indicator to prevent crashes ([#​88](https://togithub.com/SteamDeckHomebrew/decky-frontend-lib/issues/88)) ([9128c1e](https://togithub.com/SteamDeckHomebrew/decky-frontend-lib/commit/9128c1e7dadb98a8926d3dba9907a01cc78d90cf))

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