chore: bump root engines.node to >=20.19.0 to match ESLint v10

[Copilot]

Summary

Applies review feedback from #643 (discussion_r3213961603): ESLint v10 requires Node ^20.19.0, but the root engines.node still advertises >=20, allowing 20.0–20.18 where ESLint v10 may not run reliably.

• Bump root engines.node from >=20 to >=20.19.0 in package.json.

Other package.json files in the repo are unaffected — examples/{node,web} and tests/clickhouse-test-runner pin ESLint v9, and tests/clickhouse-test-runner already declares >=20.19.0.

Checklist

• A human-readable description of the changes was provided to include in CHANGELOG

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[Copilot]

Pull request overview

Updates the repository root Node engine constraint to reflect the minimum Node version required by the root ESLint v10 toolchain, preventing installs on Node 20.0–20.18 where ESLint v10 may not run.

Changes:

• Bump root package.json engines.node from >=20 to >=20.19.0.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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