halo2_proofs: Pin dev-dependencies to versions compatible with MSRV #3996

Job	Run time
Test on i686-unknown-linux-gnu	25m 42s
Test on i686-unknown-linux-gnu with beta features	22m 56s
Test on i686-unknown-linux-gnu with nightly features	21m 51s
Test on ubuntu-latest	10m 34s
Test on windows-latest	14m 38s
Test on macOS-latest	11m 5s
Test on ubuntu-latest with beta features	10m 46s
Test on windows-latest with beta features	15m 7s
Test on macOS-latest with beta features	13m 59s
Test on ubuntu-latest with nightly features	12m 19s
Test on windows-latest with nightly features	15m 28s
Test on macOS-latest with nightly features	12m 13s
Bitrot check	2m 31s
Book tests	1m 42s
Build target wasm32-unknown-unknown	2m 57s
Build target wasm32-wasi	2m 4s
Code coverage	43m 18s
Intra-doc links	1m 52s
Rustfmt	18s
	4h 1m 20s

Provide feedback