chore: update a few dependencies (thiserror, subtle, base64*) #93

Job	Run time
clippy_check_pairing	1m 57s
linux_foreign (aarch64-unknown-linux-gnu, nightly, aarch64)	21m 29s
Checking fmt and docs	13s
clippy_check_blst	2m 1s
set-msrv	12s
windows (x86_64-pc-windows-msvc, 1.67.1)	3m 41s
macos (1.67.1)	2m 23s
linux (i686-unknown-linux-gnu, 1.67.1, sudo apt update && sudo apt install gcc-multilib)	3m 53s
macos (stable)	48s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	2m 4s
linux (x86_64-unknown-linux-gnu, 1.67.1)	2m 58s
linux (x86_64-unknown-linux-gnu, stable)	55s
	42m 34s

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