balloon-hash: bump `crypto-bigint` to v0.6.0-rc.7; MSRV 1.83 (#549) #97

Job	Run time
test (i686-unknown-linux-gnu, 1.81.0, sudo apt update && sudo apt install gcc-multilib)	36s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	27s
test (x86_64-unknown-linux-gnu, 1.81.0)	14s
test (x86_64-unknown-linux-gnu, stable)	15s
minimal-versions / minimal-versions	24s
	1m 56s

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