build(deps): bump aead from 0.6.0-rc.5 to 0.6.0-rc.6 #1237

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	23s
build (stable, armv7a-none-eabi)	32s
build (1.85.0, wasm32-unknown-unknown)	16s
build (1.85.0, thumbv7em-none-eabi)	19s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 6s
build (1.85.0, armv7a-none-eabi)	14s
build (stable, wasm32-unknown-unknown)	13s
test (i686-unknown-linux-gnu, 1.85.0, sudo apt update && sudo apt install gcc-multilib)	43s
build (stable, thumbv7em-none-eabi)	13s
test (x86_64-unknown-linux-gnu, 1.85.0)	26s
	4m 25s

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