Bump `dbl` to v0.5 (#712) #92

Job	Run time
benches	15s
build (stable, armv7a-none-eabi)	22s
build (1.85.0, armv7a-none-eabi)	17s
build (stable, thumbv7em-none-eabi)	34s
build (1.85.0, wasm32-unknown-unknown)	16s
build (1.85.0, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	22s
test (x86_64-unknown-linux-gnu, stable)	23s
test (i686-unknown-linux-gnu, 1.85.0, sudo apt update && sudo apt install gcc-multilib)	1m 1s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	52s
test (x86_64-unknown-linux-gnu, 1.85.0)	20s
	4m 57s

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