test: handle gnark-crypto not returning malleable signatures anymore

[ivokub]

Description

In Consensys/gnark-crypto#725 gnark-crypto prevents returning ECDSA signatures with large s (>(mod-1)/2), but we're testing the mismatch case in the precompile tests here.

Handle it manually now and explicitly create large s in tests.

This PR currently depends on a gnark-crypto branch as the change isn't merged yet. When corresponding gnark-crypto PR is merged then also should update dependency here to gnark-crypto@master.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How has this been tested?

• TestECRecoverCircuitShortMismatch

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I did not modify files generated from templates
• golangci-lint does not output errors locally
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules