Bump macos to 15 in ci workflow #813

Job	Run time
Check dist	16s
Use setup-kubectl (ubuntu-22.04, v1.26.11, true)	8s
Use setup-kubectl (ubuntu-22.04, v1.26.11, false)	7s
Use setup-kubectl (ubuntu-22.04, v1.27.8, true)	6s
Use setup-kubectl (ubuntu-22.04, v1.27.8, false)	13s
Use setup-kubectl (ubuntu-22.04, v1.28.4, true)	8s
Use setup-kubectl (ubuntu-22.04, v1.28.4, false)	8s
Use setup-kubectl (ubuntu-22.04, v1.29.0, true)	6s
Use setup-kubectl (ubuntu-22.04, v1.29.0, false)	8s
Use setup-kubectl (ubuntu-22.04, stable, true)	6s
Use setup-kubectl (ubuntu-22.04, stable, false)	11s
Use setup-kubectl (ubuntu-22.04, latest, true)	9s
Use setup-kubectl (ubuntu-22.04, latest, false)	12s
Use setup-kubectl (macos-15, v1.26.11, true)	14s
Use setup-kubectl (macos-15, v1.26.11, false)	23s
Use setup-kubectl (macos-15, v1.27.8, true)	16s
Use setup-kubectl (macos-15, v1.27.8, false)	14s
Use setup-kubectl (macos-15, v1.28.4, true)	12s
Use setup-kubectl (macos-15, v1.28.4, false)	14s
Use setup-kubectl (macos-15, v1.29.0, true)	15s
Use setup-kubectl (macos-15, v1.29.0, false)	12s
Use setup-kubectl (macos-15, stable, true)	17s
Use setup-kubectl (macos-15, stable, false)	14s
Use setup-kubectl (macos-15, latest, true)	21s
Use setup-kubectl (macos-15, latest, false)	21s
	5m 11s

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