chore: bump minimum Node.js version from 18 to 22

[TomerFi]

Node.js 18 reached EOL in April 2025. The project should require Node.js 22 LTS as the minimum version.

Files to update

• package.json — engines.node from >= 18.0.0 to >= 22.0.0
• .github/workflows/lint.yml — node-version from 18 to 22
• .github/workflows/release.yml — node-version from 18 to 22
• .github/workflows/test_run.yml — node-version from 18 to 22