Use v0.6.x to implement v0.5.x #594

Job	Run time
fmt	17s
lint (1.56)	1m 27s
lint (1.56, -Zminimal-versions)	1m 24s
audit	14s
lint (stable)	14s
build-cross-ios (aarch64-apple-ios-sim)	37s
build-cross (x86_64-unknown-freebsd)	39s
lint (stable, -Zminimal-versions)	15s
build-cross-ios (aarch64-apple-ios)	35s
build-cross (x86_64-unknown-illumos)	38s
lint (nightly)	20s
build-cross-ios (x86_64-apple-ios)	35s
lint (nightly, -Zminimal-versions)	22s
build-cross (x86_64-unknown-netbsd)	51s
clippy-pedantic	13s
build-cross (x86_64-linux-android)	50s
cross-miri (aarch64-unknown-linux-gnu)	40s
build-cross (i686-linux-android)	50s
DevSkim	37s
cross-miri (i586-unknown-linux-gnu)	39s
doc	29s
build-cross (arm-linux-androideabi)	1m 1s
cross-miri (powerpc-unknown-linux-gnu)	37s
build-cross (aarch64-linux-android)	55s
Miri	40s
cross-miri (powerpc64-unknown-linux-gnu)	36s
package	12s
cross-miri (powerpc64le-unknown-linux-gnu)	35s
test	28s
	17m 50s

Provide feedback