docs: recommend lambda runtime nodejs14.x

[trivikr]

Description

Follow-up to #12807

Reasons for recommending NODEJS_14_X:

• Node.js 12.x went LTS in October 2019, and has been actively supported since October 2020.
• Node.js 14.x went LTS in October 2020, and is now actively supported LTS version.

Lambda added support for Node.js 14.x runtime on 2021-02-03

Testing

Verified that all changes in README are either:

• Direct calls to lambda.Function
• Indirect calls, like through cloudfront.experimental.EdgeFunction

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[gitpod-io]

[aws-cdk-automation]

AWS CodeBuild CI Report

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• Commit ID: 6df71ea
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[nija-at]

As far as I know, CloudFormation does not yet support the ZipFile property for Node14. (needs to be confirmed)

If this is this case, Code.fromInline() API will not work for Node14. Should we be recommending Node14?

[nija-at]

see #13226 (comment)

[gliptak]

Just checked and nodejs14.x ZipFile still shows:

Resource handler returned message: "Invalid request provided: The ZipFile attribute is not supported for the runtime 'nodejs14.x'"

[gliptak]

aws-cloudformation/cloudformation-coverage-roadmap#80

[gliptak]

NodeJS 14.x became supported https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-function.html

[nija-at]

Closing this pull request. Please submit a new pull request when support for CloudFormation inline is available.