fix(crypto): remove keccak_ziren.go

[gzliudan]

Proposed changes

The dependency github.com/ProjectZKM/Ziren/crates/go-runtime/zkvm_runtime breaks our tests now. Since we don't use build tag ziren, so the file crypto/keccak_ziren.go can be removed from our code base safely.

github.com/ProjectZKM/Ziren/crates/go-runtime/zkvm_runtime: github.com/ProjectZKM/Ziren/crates/go-runtime/zkvm_runtime@v0.0.0-20260124092617-829590d2c921: invalid version: unknown revision 829590d2c921

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• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Changes that don't change source code or tests
• docs: Documentation only changes
• feat: A new feature
• [X ] fix: A bug fix
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• refactor: A code change that neither fixes a bug nor adds a feature
• revert: Revert something
• style: Changes that do not affect the meaning of the code
• test: Adding missing tests or correcting existing tests

Impacted Components

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• Consensus
• Account
• Network
• Geth
• Smart Contract
• [X ] External components
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Checklist

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Tested on a private network from the genesis block and monitored the chain operating correctly for multiple epochs.
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

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[Copilot]

Pull request overview

This PR removes the Ziren zkvm implementation of Keccak256 hashing and its associated dependency. The dependency github.com/ProjectZKM/Ziren/crates/go-runtime/zkvm_runtime was causing build failures with an invalid version reference containing a future date (2026), and since the ziren build tag is not actively used in the project, the entire Ziren-specific implementation can be safely removed.

Changes:

• Removed the crypto/keccak_ziren.go file which provided an alternative Keccak256 implementation for the ziren build tag
• Removed the Ziren zkvm_runtime dependency from go.mod and go.sum

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
crypto/keccak_ziren.go	Removed entire file containing Ziren zkvm-based Keccak256 implementation (build tag: ziren)
go.mod	Removed github.com/ProjectZKM/Ziren/crates/go-runtime/zkvm_runtime dependency
go.sum	Removed checksums for the Ziren zkvm_runtime dependency

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