test: mark hr-time WPT flaky on macos15-x64 #8301

Job	Run time
Build slim tarball	1m 11s
aarch64-linux: Cache V8 build	25s
x86_64-linux: with shared libraries	28m 29s
aarch64-darwin: with shared libraries	24m 40s
x86_64-darwin: with shared libraries	42m 26s
aarch64-linux: with shared openssl-3.6.2	25m 4s
aarch64-linux: with shared boringssl-0.20260526.0	24m 48s
aarch64-linux: with shared openssl-1.1.1w	24m 21s
aarch64-linux: with shared openssl-3.0.20	25m 13s
aarch64-linux: with shared openssl-3.5.6	24m 35s
aarch64-linux: with shared openssl-4.0.0	24m 54s
	4h 6m 6s

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