go.mod: bump 4 modules

* github.com/gokrazy/firmware: https://github.com/gokrazy/firmware/compare/527ce0ed43cf...f966a2e0e4b0
* github.com/gokrazy/kernel.amd64: https://github.com/gokrazy/kernel.amd64/compare/21771250d660...5a347b66f180
* github.com/gokrazy/kernel.arm64: https://github.com/gokrazy/kernel.arm64/compare/ac43a676b0b4...3998e71b7b1d
* github.com/gokrazy/rpi-eeprom: https://github.com/gokrazy/rpi-eeprom/compare/b80c62cf428d...6a92fdda349c
* github.com/gokrazy/breakglass: already current
* github.com/gokrazy/gokrazy: already current
* github.com/gokrazy/kernel.rpi: already current
* github.com/gokrazy/serial-busybox: already current

Triggered by the gokrazy-bump workflow's schedule.

Updates #1866

Signed-off-by: Dep Updater <noreply+dep-updater@tailscale.com>
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