doc: update min mac ver + move mac arm64 to tier 1

Update the minimum macos version that can compile to match the
xcode requirements.

Also move mac arm64 to tier 1.

refs: https://github.com/nodejs/node/issues/39584#issuecomment-889701855

PR-URL: https://github.com/nodejs/node/pull/39586


Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>