fix(deps): update dependency decky-frontend-lib to v3.20.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
decky-frontend-lib	3.20.5 -> 3.20.6

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Release Notes

SteamDeckHomebrew/decky-frontend-lib

### [`v3.20.6`](https://togithub.com/SteamDeckHomebrew/decky-frontend-lib/blob/HEAD/CHANGELOG.md#​3206-httpsgithubcomSteamDeckHomebrewdecky-frontend-libcomparev3205v3206-2023-04-29) [Compare Source](https://togithub.com/SteamDeckHomebrew/decky-frontend-lib/compare/v3.20.5...v3.20.6) ##### Bug Fixes - **QuickAccessTab:** set decky tab ID to 999 ([5d5cb31](https://togithub.com/SteamDeckHomebrew/decky-frontend-lib/commit/5d5cb31638070deae9970a93c587b447d5e56559))

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