chore(deps): upgrade Shiki to v4

[songkeys]

Description

Upgrade @streamdown/code and the documentation website from Shiki 3 to Shiki 4.4.3. Shiki v4 requires Node.js 20 or newer, so this also updates the repository prerequisite and declares the requirement on the published code plugin.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Refactoring (no functional changes)

Related Issues

No related issue.

Changes Made

• Upgrade direct Shiki dependencies from ^3.19.0 to ^4.4.3.
• Require Node.js 20 or newer in the workspace and @streamdown/code package metadata.
• Update the contributor prerequisite and add a major changeset for @streamdown/code.

Testing

• All existing tests pass
• Added new tests for the changes
• Manually tested the changes

Test Coverage

• pnpm --filter @streamdown/code build
• pnpm --filter @streamdown/code test (22 tests)
• pnpm build:packages
• pnpm --filter website build
• pnpm test (all 6 test tasks passed; 1,704 tests total)
• pnpm check

Screenshots/Demos

Not applicable; this dependency upgrade does not change the user interface.

Checklist

• My code follows the project's code style
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have created a changeset (pnpm changeset)

Changeset

• I have created a changeset for these changes

Additional Notes

The Shiki v4 API used by @streamdown/code remains compatible with the existing implementation; no source changes were required. The Node.js 20 minimum is the only intended breaking change.

The lockfile still contains Shiki 3 through documentation-tooling transitive dependencies. This PR upgrades Streamdown's direct Shiki dependencies only.

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​shiki@​4.4.3

View full report

[farnabaz]

LGTM, Thanks