Bump eth.zig to v0.8.0 (Signer abstraction)

[koko1123]

What

• Bumps the eth.zig pin v0.7.0 -> v0.8.0 (the Signer abstraction release: LocalSigner + AWS KMS-backed KmsSigner).
• Migrates the three Wallet.init(allocator, private_key, &provider) call sites (context.zig, testing/mock_deployer.zig x2) to the new Wallet.initLocal(...) convenience - behavior is identical; v0.8.0's Wallet.init now takes a Signer (local key or KMS).

Why

Unblocks gator-liquidators' KMS migration: gator consumes both this SDK and eth.zig directly, and Zig only dedupes the shared eth package when both pin the SAME version - the SDK must move to v0.8.0 before gator can (otherwise duplicate vendored secp256k1 symbols fail the link with 107 errors).

Follow-up (not in this PR)

Context.init still takes a raw private key. A Context.initWithSigner(...) variant would let SDK consumers (e.g. the perpcity-bot-dev sandbox bot) sign via AWS KMS directly - worth adding once the gator pattern settles.

Verification

• zig build test (Zig 0.16.0) - 342/342 pass.
• zig fmt --check - clean.

After merge, cut tag v0.5.0 so gator can pin it.

Summary by CodeRabbit

• Chores
  • Updated a dependency reference to a newer version and refreshed its checksum.
• Bug Fixes
  • Switched wallet setup to use local initialization in app and test deployment paths for more reliable local behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: fe863ab3-7694-4d21-a72d-88f2361b024b

📥 Commits

Reviewing files that changed from the base of the PR and between b0f260f and 2776d38.

📒 Files selected for processing (3)

• build.zig.zon
• src/context.zig
• src/testing/mock_deployer.zig

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📝 Walkthrough

Walkthrough

This PR bumps the eth.zig dependency reference and hash in build.zig.zon, and updates wallet construction calls in context.zig and mock_deployer.zig to use Wallet.initLocal instead of Wallet.init, with unchanged arguments.

Changes

Dependency Bump and Wallet Initialization

Layer / File(s)	Summary
Dependency version bump build.zig.zon	The eth dependency's url git ref is updated to v0.8.0 and the hash is updated to match.
Wallet.initLocal adoption src/context.zig, src/testing/mock_deployer.zig	Wallet construction in PerpCityContext.init, deployAll, and registerModules now uses Wallet.initLocal(...) instead of Wallet.init(...), with the same allocator, private key, and provider arguments.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• StrobeLabs/perpcity-zig-sdk#8: Both PRs update build.zig.zon’s dependencies.eth fields (url/hash) to a newer revision.
• StrobeLabs/perpcity-zig-sdk#4: Both PRs bump the dependencies.eth git URL/ref and hash in build.zig.zon.
• StrobeLabs/perpcity-zig-sdk#3: Both PRs update the eth dependency's url and corresponding hash in build.zig.zon.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: upgrading eth.zig to v0.8.0 and adapting to the new signer abstraction.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch koko/eth-zig-0.8

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