Prepare for 0.8.9 release #292

Job	Run time
msys2-test	3m 0s
windows-test (nightly, i686-pc-windows-gnu)	1m 42s
windows-test (stable, i686-pc-windows-gnu)	1m 22s
windows-test (stable, x86_64-pc-windows-gnullvm)	2m 23s
windows-test (nightly, x86_64-pc-windows-gnullvm)	1m 20s
native-test (stable, ubuntu-latest)	19s
native-test (1.71.0, ubuntu-latest)	17s
native-test (nightly, macOS-latest)	30s
cross-ios-build (nightly, x86_64-apple-ios)	13s
bare-cross-build (nightly, x86_64-unknown-openbsd)	30s
native-test (1.71.0, macOS-latest)	38s
bare-cross-build (nightly, x86_64-unknown-haiku)	31s
native-test (1.71.0, windows-latest)	54s
native-test (stable, macOS-latest)	28s
native-test (nightly, ubuntu-latest)	18s
bare-cross-build (nightly, wasm32-unknown-unknown)	28s
cross-ios-build (stable, aarch64-apple-ios)	17s
native-test (stable, windows-latest)	1m 0s
cross-ios-build (stable, x86_64-apple-ios)	17s
cross-ios-build (nightly, aarch64-apple-ios)	15s
native-test (nightly, windows-latest)	52s
bare-cross-build (nightly, x86_64-unknown-redox)	32s
bare-cross-build (nightly, x86_64-unknown-fuchsia)	29s
	18m 35s

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