Replace dependency @tsconfig/node18 with @tsconfig/node20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@tsconfig/node18 (source) → @tsconfig/node20		replacement	18 → 20
@tsconfig/node18 (source) → @tsconfig/node20	devDependencies	replacement	18.2.6 → 20.1.0

This is a special PR that replaces @tsconfig/node18 with the community suggested minimal stable replacement version.

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: package-lock.json

npm warn cli npm v12.0.2 does not support Node.js v18.16.1. This version of npm supports the following node versions: `^22.22.2 || ^24.15.0 || >=26.0.0`. You can find the latest version at https://nodejs.org/.
npm error (0 , U.tracingChannel) is not a function
npm error A complete log of this run can be found in: /runner/cache/others/npm/_logs/2026-09-15T18_29_17_722Z-debug-0.log