src: remove unused using declarations in node_task_queue #6424

Job	Run time
Build slim tarball	50s
aarch64-linux: Cache V8 build	19s
x86_64-linux: with shared libraries	28m 36s
x86_64-darwin: with shared libraries	41m 44s
aarch64-darwin: with shared libraries	25m 4s
aarch64-linux: with shared openssl-3.0.19	23m 9s
aarch64-linux: with shared openssl-3.5.5	22m 39s
aarch64-linux: with shared openssl-3.6.1	24m 0s
aarch64-linux: with shared openssl-1.1.1w	22m 58s
aarch64-linux: with shared openssl-4.0.0	22m 52s
	3h 32m 11s

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