add node18 runtime

[aleborrego]

What does this PR do?

Update node18 runtime to macro

Motivation

New version of node is missing

Testing Guidelines

Updated unit tests

Additional Notes

Types of changes

• [ ] Bug fix
• [x] New feature
• [ ] Breaking change
• [ ] Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• [x] This PR's description is comprehensive
• [ ] This PR contains breaking changes that are documented in the description
• [ ] This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• [ ] This PR impacts documentation, and it has been updated (or a ticket has been logged)
• [x] This PR's changes are covered by the automated tests
• [ ] This PR collects user input/sensitive content into Datadog

[codecov-commenter]

Codecov Report

Merging #78 (5c74e28) into master (2675f47) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 5c74e28 differs from pull request most recent head 1213f73. Consider uploading reports for the commit 1213f73 to get more accurate results

@@           Coverage Diff           @@
##           master      #78   +/-   ##
=======================================
  Coverage   93.01%   93.01%           
=======================================
  Files           7        7           
  Lines         501      501           
  Branches      117      117           
=======================================
  Hits          466      466           
  Misses         26       26           
  Partials        9        9           

Impacted Files	Coverage Δ
serverless/src/layer.ts	98.85% <ø> (ø)

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[sfirrin]

Hi @aleborrego thanks a lot for this

It has been merged and released in https://github.com/DataDog/datadog-cloudformation-macro/releases/tag/serverless-macro-0.5.3