Bump halo2curves to 0.7 #1232

Job	Run time
Bitrot check	1m 24s
Build target wasm32-unknown-unknown	2m 21s
Test on ubuntu-latest with basic features	3m 56s
Build target wasm32-wasi	2m 24s
Test on windows-latest with basic features	4m 9s
Intra-doc links	55s
Test on macOS-latest with basic features	3m 30s
Run the examples	1m 34s
Test on ubuntu-latest with all features	4m 13s
Rustfmt	14s
Test on windows-latest with all features	4m 9s
Test on macOS-latest with all features	4m 8s
	32m 57s

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