There is an updated pull request by Johnnynator against master on the void-packages repository

https://github.com/Johnnynator/void-packages qt6.6
https://github.com/void-linux/void-packages/pull/46659

qt6: update to 6.6.0
- telegram-desktop: rebuild against qt6-6.6.0
- qt6-3d: update to 6.6.0.
- qt6-base: update to 6.6.0.
- qt6-charts: update to 6.6.0.
- qt6-connectivity: update to 6.6.0.
- qt6-declarative: update to 6.6.0.
- qt6-imageformats: update to 6.6.0.
- qt6-location: update to 6.6.0.
- qt6-lottie: update to 6.6.0.
- qt6-multimedia: update to 6.6.0.
- qt6-networkauth: update to 6.6.0.
- qt6-position: update to 6.6.0.
- qt6-qt5compat: update to 6.6.0.
- qt6-quick3d: update to 6.6.0.
- qt6-quicktimeline: update to 6.6.0.
- qt6-remoteobjects: update to 6.6.0.
- qt6-scxml: update to 6.6.0.
- qt6-sensors: update to 6.6.0.
- qt6-serialport: update to 6.6.0.
- qt6-shadertools: update to 6.6.0.
- qt6-svg: update to 6.6.0.
- qt6-tools: update to 6.6.0.
- qt6-translations: update to 6.6.0.
- qt6-virtualkeyboard: update to 6.6.0.
- qt6-wayland: update to 6.6.0.
- qt6-webchannel: update to 6.6.0.
- qt6-webengine: update to 6.6.0.
- qt6-websockets: update to 6.6.0.

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[skip ci]

A patch file from https://github.com/void-linux/void-packages/pull/46659.patch is attached