ci: rollout macos-12 in favor of macos-15 #3362

Job	Run time
Prepare Go modules cache	10s
Smoke Tests	0s
macos-latest (AppSec disabled)	2m 5s
linux/amd64 golang:1.23-bookworm	1m 20s
windows-latest (AppSec disabled)	4m 2s
linux/arm64 golang:1.23-bookworm	3m 36s
ubuntu-latest-16-cores (AppSec disabled)	1m 14s
linux/amd64 golang:1.23-bullseye	1m 25s
linux/arm64 golang:1.23-bullseye	3m 33s
linux/amd64 golang:1.23-alpine	1m 28s
macos-13 go1.23	7m 54s
linux/arm64 golang:1.23-alpine	3m 25s
macos-13 go1.22	5m 11s
linux/amd64 golang:1.22-bookworm	1m 26s
macos-15 go1.23	3m 15s
linux/arm64 golang:1.22-bookworm	3m 32s
macos-15 go1.22	4m 21s
linux/amd64 golang:1.22-bullseye	1m 23s
linux/arm64 golang:1.22-bullseye	3m 28s
linux/amd64 golang:1.22-alpine	1m 27s
linux/arm64 golang:1.22-alpine	3m 7s
	57m 22s

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