ansible: add extra M1 macs

[AshCripps]

@nodejs/build-infra can I get 83.147.191.75 added to the test ci and 83.147.191.76 added to the release ci

[richardlau]

@nodejs/build-infra can I get 83.147.191.75 added to the test ci and 83.147.191.76 added to the release ci

It should be relatively low risk to do this but I'll probably hold off doing so until after the Node.js 16 release goes out today.

[mhdawson]

LGTM

[richardlau]

The release machine has been added to the ci-release firewall.

The iptables playbook appears to still work (🎉) but it's erroring against the public CI host because there are stale host entries in secrets that don't have a matching entry in the inventory (i.e. presumably they've been removed but not cleared up from secrets, and also a reason for some of the failures in #2531). I'll let you know when the test machine has been added.

[AshCripps]

Both Machines added to ci

[richardlau]

FTR I let @AshCripps know that the test machine has been added to the public CI before he added it 😄. I had to update the iptables playbook to filter out entries -- I'll open a PR with the changes.