ci: bump actions to Node 24 runtimes

[manuelmauro]

Why

The v0.4.0 release run logged the Node.js 20 deprecation warning. GitHub forces Node 24 on JavaScript actions starting 2026-06-16 and removes Node 20 on 2026-09-16.

Changes

Bumped the flagged actions to their latest majors — each verified to declare using: node24:

Action	Before	After
actions/checkout	v4	v6
actions/upload-artifact	v4	v7
actions/download-artifact	v4	v8
softprops/action-gh-release	v2	v3

Applied across both ci.yml and release.yml. dtolnay/rust-toolchain@stable and Swatinem/rust-cache@v2 were not in the deprecation warning and are left unchanged.

Compatibility

• Artifact upload/download stay compatible: both sit on the v4+ artifact backend. Upload uses explicit per-target names; the release job downloads all artifacts into subdirs and collects them via find, which is layout-agnostic.
• action-gh-release@v3 keeps the same inputs used here (name, draft, prerelease, generate_release_notes, files).

Test plan

• CI (this PR) exercises checkout@v6 on the Rust build/test/clippy/fmt path.
• The release.yml changes (upload/download/gh-release) only run on a v* tag push, so they'll be exercised on the next release.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ce1a6e76-87dd-4188-9f03-ebb4890a0f55

📥 Commits

Reviewing files that changed from the base of the PR and between 38ca322 and 186c16c.

📒 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/bump-node24-actions

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