There's a merged pull request on the void-packages repository

rpi-firmware: use raspbian as source for wifi and bluetooth firmware
https://github.com/void-linux/void-packages/pull/14774

Description:
This pull request changes the source for the WiFi and Bluetooth firmware to Raspbian. As the official Raspberry Pi distro, it receives the firmware directly from Cypress and always has the most recent versions. The changes over the current source:

brcmfmac43430-sdio.txt
- Improved brcmfmac BT coexistence parameters

BCM4345C0.hcd
- Restores the LEScan capability
- Enables BT 4.2 functionality