bump: v3.0.6 #238

Job	Run time
Test (aarch64-unknown-linux-musl)	10m 8s
Test (x86_64-unknown-linux-musl)	2m 48s
Test (riscv64gc-unknown-linux-gnu)	11m 1s
Test (aarch64-unknown-linux-gnu)	12m 3s
	36m 0s

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