chore: dump "process.versions" in "/debug" endpoint

[hi-ogawa]

This is to verify node version on aws lambda.

It looks like just setting up AWS_LAMBDA_JS_RUNTIME=nodejs16.x works as described in

• Node v16 Released 🎉 aws/aws-lambda-base-images#14 (comment)

# before
$ curl -s https://627dd262dba3120fb5d17f25--ytsub-v3-hiro18181.netlify.app/debug | jq
{
  "APP_DEFINE_STAGING": "1",
  "process.versions": {
    "node": "14.19.1",
    "v8": "8.4.371.23-node.85",
    "uv": "1.42.0",
    "zlib": "1.2.11",
    "brotli": "1.0.9",
    "ares": "1.18.1",
    "modules": "83",
    "nghttp2": "1.42.0",
    "napi": "8",
    "llhttp": "2.1.4",
    "openssl": "1.1.1n",
    "cldr": "39.0",
    "icu": "69.1",
    "tz": "2021a",
    "unicode": "13.0"
  }
}

# after
$ curl -s https://627dd1cf1fbee20cf138ba72--ytsub-v3-hiro18181.netlify.app/debug | jq
{
  "APP_DEFINE_STAGING": "1",
  "process": {
    "versions": {
      "node": "16.14.0",
      "v8": "9.4.146.24-node.20",
      "uv": "1.43.0",
      "zlib": "1.2.11",
      "brotli": "1.0.9",
      "ares": "1.18.1",
      "modules": "93",
      "nghttp2": "1.45.1",
      "napi": "8",
      "llhttp": "6.0.4",
      "openssl": "1.1.1m+quic",
      "cldr": "40.0",
      "icu": "70.1",
      "tz": "2021a3",
      "unicode": "14.0",
      "ngtcp2": "0.1.0-DEV",
      "nghttp3": "0.1.0-DEV"
    }
  }
}