Test

Bump CI image to macOS 26 #370

Job	Run time
check (MarkSweep, release, ubuntu-latest)	12m 14s
check (MarkSweep, release, macos-26)	14m 25s
check (Immix, release, macos-26)	10m 47s
check (MarkSweep, debug, 150, macos-26)	38m 1s
check (MarkSweep, debug, 150, ubuntu-latest)	1h 23m 9s
check (Immix, release, ubuntu-latest)	11m 41s
check (Immix, debug, 150, macos-26)	5m 11s
check (Immix, debug, 150, ubuntu-latest)	1h 9m 53s
	4h 5m 21s

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