Bump `aead` crate dependency to v0.6.0-rc.5 (#758) #1240

Job	Run time
build (stable, thumbv7em-none-eabi)	18s
test (i686-unknown-linux-gnu, 1.85.0, sudo apt update && sudo apt install gcc-multilib)	45s
build (stable, armv7a-none-eabi)	17s
test (x86_64-unknown-linux-gnu, stable)	21s
build (1.85.0, thumbv7em-none-eabi)	17s
test (x86_64-unknown-linux-gnu, 1.85.0)	25s
build (1.85.0, wasm32-unknown-unknown)	18s
build (1.85.0, armv7a-none-eabi)	16s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	50s
build (stable, wasm32-unknown-unknown)	15s
	4m 2s

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