chore(ci): bump actions/checkout and actions/setup-node to v5

[pchuri]

Summary

Bumps all actions/checkout and actions/setup-node references in .github/workflows/ci.yml to @v5 to clear the Node 20 deprecation warnings on every CI run.

Context

The original plan (issue #175) was to bump @v3 → @v4. Verifying CI logs after that hop showed the warning still fires on @v4:

Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: actions/checkout@v4, actions/setup-node@v4

@v5 runs on Node 24 and clears the warning immediately, instead of waiting for GitHub's forced auto-migration of v4.

Scope

Line	Job	Before	After
23	test	actions/checkout@v3	actions/checkout@v5
26	test	actions/setup-node@v3	actions/setup-node@v5
38	security	actions/checkout@v3	actions/checkout@v5
56	publish	actions/checkout@v3	actions/checkout@v5
62	publish	actions/setup-node@v3	actions/setup-node@v5
119	update-homebrew	actions/checkout@v4	actions/checkout@v5

Line 119 was already at @v4; bumped along with the rest for consistency.

Test plan

• CI test matrix passes on Node 18.x / 20.x / 22.x (v5 of setup-node still installs older Node versions for the project; only the action's own runtime is Node 24)
• security job (npm audit) passes
• No more Node.js 20 actions are deprecated warning annotations on this run
• publish / update-homebrew paths are unchanged in behavior (no release-triggering changes)

Closes #175

[github-actions]

🎉 This PR is included in version 2.6.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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