chore(clients): remove unsupported version deprecation warning

[trivikr]

Issue

No longer needed, as Node.js 12.x support is removed in #4123

Description

Removes call to unsupported version deprecation warning in runtimeConfig

Testing

Verified that warning is no longer emitted:

// test.js
const { DynamoDB } = require("../aws-sdk-js-v3/clients/client-dynamodb");
const { S3 } = require("../aws-sdk-js-v3/clients/client-s3");

const dynamodbClient = new DynamoDB();
const s3Client = new S3();

$ fnm use 12
Using Node v12.22.12

# No warning is emitted
$ node test.js

Additional context

Related smithy-lang/smithy-typescript#624

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[trivikr]

Superceded by #4127

[github-actions]

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