feat: Add support for Node 20

[duncanista]

What does this PR do?

Adds support for Node 20 as it's available for AWS Lambda.

Motivation

It's widely available, and the latest layer (v100) has already been released with support for it.

Also #448

Testing Guidelines

• Unit tests
• Integration tests

Additional Notes

Types of changes

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

Check all that apply

• 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)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (543c369) 75.97% compared to head (84a7117) 75.97%.

❗ Current head 84a7117 differs from pull request most recent head d989f1e. Consider uploading reports for the commit d989f1e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #449   +/-   ##
=======================================
  Coverage   75.97%   75.97%           
=======================================
  Files          13       13           
  Lines         945      945           
  Branches      297      297           
=======================================
  Hits          718      718           
  Misses        166      166           
  Partials       61       61           

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