chore: remove unused min func

[stemlaud]

Description

Go 1.21 adds built-in functions min and max. https://tip.golang.org/doc/go1.21
Therefore, we can directly remove our own implementations and use the built-in function with the same names.

Fixes # (issue)

Type of change

• New feature (non-breaking change which adds functionality)

How has this been tested?

• Test A
• Test B

How has this been benchmarked?

• Benchmark A, on Macbook pro M1, 32GB RAM
• Benchmark B, on x86 Intel xxx, 16GB RAM

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

[stemlaud]

@ivokub Hi, Could you please review this PR at your convenience? Thank you very much.

[ivokub]

@ivokub Hi, Could you please review this PR at your convenience? Thank you very much.

Thanks for the contribution. Seems to be a small change. We will merge small community PRs into a single commit to be merged to gnark master before next release to simplify review, CI and development workflow.