chore: update Node.js version 20.9 to 20.19

[joeyzhao2018]

What does this PR do?

update Node.js version from 20.9 to 20.19

Motivation

Github job ran into issue with the old version of node20

error proc-log@6.0.0: The engine "node" is incompatible with this module. Expected version "^20.17.0 || >=22.9.0". Got "20.9.0"

https://github.com/DataDog/datadog-lambda-js/actions/runs/19480386316/job/55832092039

Testing Guidelines

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
• This PR passes the integration tests (ask a Datadog member to run the tests)