build(deps): bump signature from 2.1.0 to 2.2.0 (#990) #179

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	3m 44s
build (1.65.0, wasm32-unknown-unknown)	3m 44s
build (stable, thumbv7em-none-eabi)	21s
doc	30s
cross (armv7-unknown-linux-gnueabihf, 1.65.0)	4m 49s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 20s
cross (aarch64-unknown-linux-gnu, 1.65.0)	4m 53s
build (stable, wasm32-unknown-unknown)	19s
test (i686-unknown-linux-gnu, 1.65.0, sudo apt update && sudo apt install gcc-multilib)	4m 56s
cross (aarch64-unknown-linux-gnu, stable)	1m 17s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 19s
cross (powerpc-unknown-linux-gnu, 1.65.0)	4m 46s
test (x86_64-unknown-linux-gnu, 1.65.0)	4m 36s
cross (powerpc-unknown-linux-gnu, stable)	1m 21s
test (x86_64-unknown-linux-gnu, stable)	59s
	38m 54s

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