Bump eth.zig to v0.2.1

[koko1123]

Summary

• Bump eth.zig dependency from v0.2.0 to v0.2.1

v0.2.1 is the performance release with major optimizations across RLP, ABI, transaction encoding, u256 arithmetic, and secp256k1 signing. eth-zig now wins 18/24 benchmarks against alloy.rs.

See https://github.com/StrobeLabs/eth.zig/releases/tag/v0.2.1 for full release notes.

Test plan

• zig build succeeds
• zig build test passes

Summary by CodeRabbit

• Chores
  • Updated eth.zig dependency to v0.2.1.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between cfcea5a and 4cf7856.

📒 Files selected for processing (1)

• build.zig.zon

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📝 Walkthrough

Walkthrough

The pull request updates the eth.zig dependency in build.zig.zon from version v0.2.0 to v0.2.1, modifying both the Git repository URL reference and its associated integrity hash to reflect the newer release.

Changes

Cohort / File(s)	Summary
Dependency Version Bump build.zig.zon	Updates eth.zig dependency from v0.2.0 to v0.2.1, changing both the URL reference and hash value for the external Git dependency.

Possibly related PRs

• Bump eth.zig to v0.2.0, add publishing docs #2 — Previously bumped eth.zig to v0.2.0; this PR further advances it to v0.2.1, continuing the dependency update sequence.

Poem

🐰 A hop, a skip, to v-point-two-point-one,
The eth.zig dependency shines in the sun,
Hash updated, URL aligned,
A smoother build, perfectly designed! ✨

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bump/eth-zig-v0.2.1

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