ci: run workflows on Node 22 (required by @vscode/vsce 4)

[FROWNINGdev]

@vscode/vsce 4.0.0 (#112) raises its Node.js baseline to 22 (microsoft/vscode-vsce#1308). CI and the publish workflow still pin Node 20, so the packaging step would run on an unsupported runtime. This moves both workflows to Node 22 ahead of merging #112.

Summary by CodeRabbit

• Chores
  • Updated automated build, test, packaging, and publishing workflows to use Node.js 22.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 5e25fc3f-eb21-4ee8-8905-3775a4cf2ece

📥 Commits

Reviewing files that changed from the base of the PR and between b07f87c and 399c2ea.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/publish.yml

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📝 Walkthrough

Walkthrough

Both CI workflows now use Node.js 22 instead of Node.js 20. The build workflow applies Node.js 22 to installation, build, test, and VSIX packaging steps.

Changes

Node.js 22 CI Update

Layer / File(s)	Summary
Workflow runtime update .github/workflows/ci.yml, .github/workflows/publish.yml	The build and publish workflows now configure Node.js 22 instead of Node.js 20.

Priority: ⬇️ Low

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

Change: Bug fix

🚥 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 describes the main change: updating CI workflows to use Node.js 22. It also states the reason for the change, the Node.js requirement of @vscode/vsce 4.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

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