zisk: switch to official bls12_381 precompile patch

[jsign]

In #179, ZisK can compile stateless-validator which is why the mainnet integration tests were enabled.

The current bls12_381 precompile patch of zisk creates a conflict in our ere-guests since it's referring to an old dependency. This has been known for a while, look #116.

The current workaround is using a "patched patch", which bumps the problematic dependency until the official ZisK patch does it. This is set in this repo here.

cc @han0110

Edit: Also ideally when this is solve we can avoid the double-slash hack to trick Cargo.

[han0110]

I think we could do something simpler like han0110/bls12_381@5220495 to avoid the conflict again if sp1 is upgraded to v6.

Will ask ZisK team if they could do so as well.