Support node.js >= 16 for supporting packages

[dungdung]

Hello!

I'm seeing the following logs running npm install with on node.js 18

npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@jsonhero/json-infer-types@1.2.11',
npm WARN EBADENGINE   required: { node: '16' },
npm WARN EBADENGINE   current: { node: 'v18.14.2', npm: '9.5.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@jsonhero/json-schema-fns@0.0.1',
npm WARN EBADENGINE   required: { node: '16' },
npm WARN EBADENGINE   current: { node: 'v18.14.2', npm: '9.5.0' }
npm WARN EBADENGINE }

I see a recent release allows node.js >= 16 for this package, but the two supporting packages @jsonhero/json-infer-types and @jsonhero/json-schema-fns still only support node.js 16.