Install clang-tidy on debian only for clang-21 #262

Job	Run time
build (linux/amd64, ubuntu-24.04, noble, gcc, 13)	3m 59s
build (linux/amd64, ubuntu-24.04, noble, gcc, 14)	4m 32s
build (linux/amd64, ubuntu-24.04, jammy, gcc, 12)	4m 49s
build (linux/amd64, ubuntu-24.04, noble, clang, 18)	4m 45s
build (linux/amd64, ubuntu-24.04, noble, clang, 16)	4m 44s
build (linux/arm64, ubuntu-24.04-arm, noble, clang, 21)	4m 23s
build (linux/arm64, ubuntu-24.04-arm, noble, clang, 18)	4m 59s
build (linux/arm64, ubuntu-24.04-arm, noble, clang, 20)	4m 9s
build (linux/arm64, ubuntu-24.04-arm, noble, clang, 16)	3m 49s
build (linux/arm64, ubuntu-24.04-arm, jammy, gcc, 12)	4m 6s
build (linux/amd64, ubuntu-24.04, noble, clang, 19)	4m 33s
build (linux/arm64, ubuntu-24.04-arm, noble, clang, 17)	4m 17s
build (linux/arm64, ubuntu-24.04-arm, noble, gcc, 13)	4m 35s
build (linux/arm64, ubuntu-24.04-arm, noble, gcc, 14)	4m 13s
build (linux/arm64, ubuntu-24.04-arm, noble, clang, 19)	4m 3s
build (linux/amd64, ubuntu-24.04, noble, clang, 21)	4m 41s
build (linux/amd64, ubuntu-24.04, noble, clang, 20)	4m 27s
build (linux/amd64, ubuntu-24.04, noble, clang, 17)	4m 43s
merge	-1s
	1h 19m 46s

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