ci: bump GitHub Actions to non-deprecated versions

[UnbreakableMJ]

Resolves the Node 20 / set-output deprecation warnings seen in the v0.1.4 release run.

• actions/checkout v3/v4 → v6 (release.yml + ci.yml)
• softprops/action-gh-release v1 → v3 (create-release + asset upload)
• replace the archived actions-rs/toolchain@v1 with dtolnay/rust-toolchain@stable (targets: ${{ matrix.target }}), matching ci.yml — this removes the set-output deprecation warning

Versions pulled from the GitHub API (checkout v6.0.3, action-gh-release v3.0.0), pinned to majors. Affects future runs only; the existing v0.1.4 release is unchanged.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 17ec6e1c-79a4-4a60-b412-81940adac16b

📥 Commits

Reviewing files that changed from the base of the PR and between 4bbc927 and 74c2dfc.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci-action-bumps

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