Update changelog for 0.7.3 release (#391) #839

Job	Run time
lint	20s
clippy (stable)	2m 2s
clippy (beta)	1m 8s
coverage	3m 20s
build (stable)	2m 11s
build (beta)	1m 58s
build (nightly-2022-12-13)	2m 5s
build-no-alloc (thumbv6m-none-eabi)	2m 8s
build-no-alloc (thumbv7m-none-eabi)	2m 22s
build-no-alloc (thumbv8m.main-none-eabi)	1m 51s
build-no-alloc (aarch64-linux-android)	2m 10s
build-no-alloc (aarch64-apple-ios)	2m 20s
deny (advisories)	55s
deny (bans licenses sources)	59s
sort	55s
test (stable)	4m 35s
test (beta)	4m 32s
test (nightly-2022-12-13)	4m 56s
doc (stable)	1m 8s
doc (beta)	1m 23s
notify	3s
	43m 21s

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