chore(core): skip emitting warning for Node.js 14.x

[trivikr]

Issue

Internal JS-5174

Support for Node.js 14.x ended in #6034

Description

Skip emitting warning for Node.js 14.x

Testing

Build client-dynamodb in aws-sdk-js-v3

$ client-dynamodb> yarn build:include:deps

Prepare test file in test package

$> echo 'import { DynamoDB } from "../aws-sdk-js-v3/clients/client-dynamodb/dist-cjs/index.js"; const client = new DynamoDB();' > index.mjs

Before

$> node -v
v14.21.3

$> node index.mjs
(node:38205) Warning: NodeDeprecationWarning: The AWS SDK for JavaScript (v3) will
no longer support Node.js 14.x on May 1, 2024.

To continue receiving updates to AWS services, bug fixes, and security
updates please upgrade to an active Node.js LTS version.

More information can be found at: https://a.co/dzr2AJd
(Use `node --trace-warnings ...` to show where the warning was created)

After

No warning is emitted.
No error is thrown during client creation, as we don't use Node.js 16.x specific API or specification.

$> node -v
v14.21.3

$> node index.mjs

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