chore: remove some dead code #90

Job	Run time
set-msrv	12s
clippy_check_pairing	1m 57s
clippy_check_blst	1m 59s
Checking fmt and docs	14s
linux_foreign (aarch64-unknown-linux-gnu, nightly, aarch64)	22m 13s
linux (i686-unknown-linux-gnu, 1.67.1, sudo apt update && sudo apt install gcc-multilib)	3m 52s
windows (x86_64-pc-windows-msvc, 1.67.1)	3m 54s
macos (1.67.1)	2m 38s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	2m 12s
macos (stable)	47s
linux (x86_64-unknown-linux-gnu, 1.67.1)	2m 51s
linux (x86_64-unknown-linux-gnu, stable)	54s
	43m 43s

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