update Cargo.toml for release v2.6.6

[nikhilsinhaparseable]

Summary by CodeRabbit

• Chores
  • Released version 2.6.6 with updated downloadable assets and checksum.
  • CI updated to use the stable Rust toolchain action for builds.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: e22e0a3e-cef4-4feb-9072-ff1ae6146f49

📥 Commits

Reviewing files that changed from the base of the PR and between ec3353a and 4d072e3.

📒 Files selected for processing (1)

• .github/workflows/build.yaml

✅ Files skipped from review due to trivial changes (1)

• .github/workflows/build.yaml

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Walkthrough

Bump crate version 2.6.5 → 2.6.6 in Cargo.toml, update package.metadata.parseable_ui asset URL and SHA1; switch GitHub Actions Rust toolchain action from dtolnay/rust-toolchain@nightly to dtolnay/rust-toolchain@stable in .github/workflows/build.yaml.

Changes

Cohort / File(s)	Summary
Version & asset metadata Cargo.toml	Updated package.version 2.6.5 → 2.6.6; package.metadata.parseable_ui.assets-url → .../v2.6.6/build.zip; updated assets-sha1.
CI toolchain update .github/workflows/build.yaml	Replaced dtolnay/rust-toolchain@nightly with dtolnay/rust-toolchain@stable in Rust setup steps across workflow jobs; targets unchanged.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• chore: update cargo toml for release-v2.3.4 #1358: Bumps Cargo.toml version and updates package.metadata.parseable_ui assets/sha1 (release artifact update).
• update Cargo.toml for release v2.6.4 #1596: Same manifest fields changed (package.version and parseable_ui assets/sha1) for a release.
• update Cargo toml for release v2.5.1 #1463: Same kind of Cargo.toml bump and parseable_ui asset metadata update.

Suggested reviewers

• nitisht
• parmesant

Poem

🐰 A hop, a tiny patch in sight,
Version nudged forward, CI set right.
Assets refreshed, checksums align,
Little rabbit hops—release is fine! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request description is completely missing. The required template includes sections for Description, key changes, and testing checklist that should be filled out.	Add a pull request description following the repository template, including the goal of the release, key changes, and completion of the testing checklist items.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and specifically describes the main change: updating Cargo.toml for the v2.6.6 release, which matches the version bump from 2.6.5 to 2.6.6 in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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