Update rand requirement from 0.8 to 0.9 #1271

Job	Run time
test stable-x86_64-unknown-linux-gnu	58s
test nightly-x86_64-unknown-linux-gnu	51s
test stable-i686-unknown-linux-gnu	48s
test nightly-i686-unknown-linux-gnu	53s
test stable-aarch64-unknown-linux-gnu	48s
test nightly-aarch64-unknown-linux-gnu	51s
test stable-armv7-unknown-linux-gnueabihf	51s
test nightly-armv7-unknown-linux-gnueabihf	49s
test stable-riscv64gc-unknown-linux-gnu	52s
test nightly-riscv64gc-unknown-linux-gnu	54s
test stable-thumbv7neon-unknown-linux-gnueabihf	46s
test nightly-thumbv7neon-unknown-linux-gnueabihf	52s
test stable-loongarch64-unknown-linux-gnu	53s
test nightly-loongarch64-unknown-linux-gnu	58s
test stable-x86_64-apple-darwin	41s
test nightly-x86_64-apple-darwin	1m 0s
test stable-aarch64-apple-darwin	39s
test nightly-aarch64-apple-darwin	43s
test stable-x86_64-pc-windows-gnu	2m 39s
test nightly-x86_64-pc-windows-gnu	1m 41s
test stable-i686-pc-windows-gnu	1m 53s
test nightly-i686-pc-windows-gnu	1m 52s
test stable-x86_64-pc-windows-msvc	2m 50s
test nightly-x86_64-pc-windows-msvc	2m 37s
test stable-i686-pc-windows-msvc	2m 13s
test nightly-i686-pc-windows-msvc	1m 28s
	32m 20s

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