src: fix deadlock in NodePlatform::DrainTasks #4500

Job	Run time
Build slim tarball	1m 55s
aarch64-darwin: with shared libraries	19m 13s
x86_64-linux: with shared libraries	25m 58s
x86_64-darwin: with shared libraries	31m 1s
aarch64-linux: with shared libraries	20m 25s
	1h 38m 32s

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