provisioning/rpi4: various updates

[dustymabe]

commit bec813d5be3869eff192311fb7d2795c5a7511f4
Author: Dusty Mabe <dusty@dustymabe.com>
Date:   Mon Mar 27 17:25:45 2023 -0400

    provisioning/rpi4: update to latest versions
    
    It's been a while since we updated this page. Let's update to the
    latest versions of the components and open bugs for any issues that
    pop up.

commit efc610a3e57bcab6601528e226527d9b7f5eee9c
Author: Dusty Mabe <dusty@dustymabe.com>
Date:   Mon Mar 27 17:24:27 2023 -0400

    provisioning/rpi4: drop guidance on 10/08/21 EEPROM release
    
    At this point there have been releases since then and it's unlikely
    this guidance is still useful.

commit 5b81df1321122085a91c7dca7dcecfce20f86a67
Author: Dusty Mabe <dusty@dustymabe.com>
Date:   Mon Mar 27 17:23:46 2023 -0400

    provisioning/rpi4: switch out link to rpi4-uefi.dev
    
    That domain has either lapsed or the server isn't currently running.

[dustymabe]

I'll test these changes as part of test day tomorrow.

[dustymabe]

OK. I've tested these changes out as part of test day today and they seem to be good. Marking as ready for review!

[dustymabe]

Thanks for the review!