doc: downgrade macOS x64 to Tier 2 #7493

Job	Run time
Build slim tarball	1m 18s
aarch64-linux: Cache V8 build	21s
aarch64-darwin: with shared libraries	20m 13s
x86_64-linux: with shared libraries	27m 11s
x86_64-darwin: with shared libraries	35m 43s
aarch64-linux: with shared openssl-3.6.1	22m 42s
aarch64-linux: with shared openssl-3.5.5	22m 59s
aarch64-linux: with shared openssl-3.0.19	23m 12s
aarch64-linux: with shared openssl-1.1.1w	22m 15s
aarch64-linux: with shared openssl-4.0.0	22m 45s
aarch64-linux: with shared boringssl-0.20260413.0	22m 11s
	3h 40m 50s

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