feat: end support for Node.js 12.x

[trivikr]

Issue

We announced the end of support for Node.js 12.x in the AWS SDK for JavaScript (v3) starting November 1, 2022 back in May.

Description

Bump engines to node >=14.0.0 in package.json

Testing

Verified that error would be thrown in Node.js 12.x if engine-strict=true is set.

$ client-acm> yarn build:include:deps
...

$ client-acm> npm pack
...
npm notice === Tarball Details === 
npm notice name:          @aws-sdk/client-acm                     
npm notice version:       3.200.0                                 
npm notice filename:      @aws-sdk/client-acm-3.200.0.tgz         
npm notice package size:  57.7 kB                                 
npm notice unpacked size: 503.2 kB                                
npm notice shasum:        02b2a9269ce5a0b6b1791063c3f231577d9de4da
npm notice integrity:     sha512-sukMz6DPM2Usi[...]pBEo7wb7X/mHQ==
npm notice total files:   108                                     
npm notice 
aws-sdk-client-acm-3.200.0.tgz

$ test> node -v
v12.22.12

$ test> npm config set engine-strict false

$ test> npm install ../aws-sdk-js-v3/clients/client-acm/aws-sdk-client-acm-3.200.0.tgz
...
+ @aws-sdk/client-acm@3.200.0

$ test> npm config set engine-strict true

$ test> npm install ../aws-sdk-js-v3/clients/client-acm/aws-sdk-client-acm-3.200.0.tgz
...
npm ERR! code ENOTSUP
npm ERR! notsup Unsupported engine for @aws-sdk/client-acm@3.200.0: wanted: {"node":">=14.0.0"} (current: {"node":"12.22.12","npm":"6.14.16"})
npm ERR! notsup Not compatible with your version of node/npm: @aws-sdk/client-acm@3.200.0
npm ERR! notsup Not compatible with your version of node/npm: @aws-sdk/client-acm@3.200.0
npm ERR! notsup Required: {"node":">=14.0.0"}
npm ERR! notsup Actual:   {"npm":"6.14.16","node":"12.22.12"}
...

Error is not thrown on Node.js 14.x

$ test> fnm use 14
Using Node v14.20.1

$ test> npm config set engine-strict true

$ test> npm install ../aws-sdk-js-v3/clients/client-acm/aws-sdk-client-acm-3.200.0.tgz
...
+ @aws-sdk/client-acm@3.200.0

Additional context

Code change to update engines field for new clients smithy-lang/smithy-typescript#623

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