Merge pull request #191 from quartiq/deps #610

Job	Run time
examples (mqtt)	33s
audit	10s
examples (readback)	32s
compile (stable, thumbv7em-none-eabihf)	55s
documentation	19s
compile (1.65.0, thumbv7em-none-eabihf)	3m 9s
style	41s
test (stable)	49s
test (stable, --all-features)	48s
test (stable, --no-default-features)	28s
test (stable, --no-default-features --features json-core)	31s
test (1.65.0)	2m 57s
test (1.65.0, --all-features)	2m 58s
test (1.65.0, --no-default-features)	2m 35s
test (1.65.0, --no-default-features --features json-core)	2m 36s
	20m 1s

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