Use `macos-12` runner for x64 macOS jobs #23938

Job	Run time
Cancel Previous Runs	4s
Engine (GraalVM CE) (macos, x86_64)	34m 33s
Engine (GraalVM CE) (linux, x86_64)	15m 49s
Engine (GraalVM CE) (windows, x86_64)	4m 10s
JVM Tests (GraalVM CE) (linux, x86_64)	15m 30s
JVM Tests (GraalVM CE) (macos, x86_64)	38m 23s
JVM Tests (GraalVM CE) (windows, x86_64)	31m 38s
Standard Library Tests (GraalVM CE) (linux, x86_64)	14m 51s
Standard Library Tests (GraalVM CE) (macos, x86_64)	46m 55s
Standard Library Tests (GraalVM CE) (windows, x86_64)	15m 56s
Verify License Packages (linux, x86_64)	1m 36s
	3h 39m 25s

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