Fix unsound use of Rooted<T> with RootKind::Traceable #32

Job	Run time
elevated	0s
normal / android	6m 49s
normal / linux (debugmozjs)	10m 53s
normal / linux (aarch64-unknown-linux-gnu)	13m 37s
normal / integrity	41s
normal / linux (streams)	11m 5s
normal / linux (armv7-unknown-linux-gnueabihf)	12m 24s
normal / mac (debugmozjs, aarch64-apple-darwin, macos-14)	7m 55s
normal / mac (debugmozjs, x86_64-apple-darwin, macos-13)	14m 41s
normal / OpenHarmony (aarch64-unknown-linux-ohos)	9m 29s
normal / windows (debugmozjs, x86_64-pc-windows-msvc)	17m 44s
normal / mac (streams, aarch64-apple-darwin, macos-14)	5m 38s
normal / OpenHarmony (x86_64-unknown-linux-ohos)	9m 23s
normal / windows (debugmozjs, aarch64-pc-windows-msvc)	13m 20s
normal / mac (streams, x86_64-apple-darwin, macos-13)	14m 20s
normal / windows (streams, x86_64-pc-windows-msvc)	15m 26s
normal / windows (streams, aarch64-pc-windows-msvc)	12m 28s
normal / Check version and publish release	0s
normal / Verify release	0s
normal / Result	1s
Result	1s
	2h 55m 55s

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