package/rpi-firmware: bump version

Bump for misc fixes and enhancements:
  - firmware: smaller cut-down (aka rescue) firmware
  - audio: sample rates, float samples, any-number-of-channels
  - hdmi: fix for (high?) output rates
  - video: h264 decode when changing resolution
  - camera: high frame rates, full FoV

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>