chore: Deprecate Node.js 14.x

[duncanista]

What does this PR do?

Drops support for Node.js 14.x.

Motivation

Since it is in deprecation phase 2 by AWS.

Testing Guidelines

Automated checks.

Additional Notes

There's a note about dc-polyfill which we should check. Not done in this PR yet.

datadog-lambda-js/src/runtime/require-tracer.ts

Lines 1 to 3 in 039b04e

	// TODO NEXT MAJOR (AJ): Remove this when we drop node14
	const dc = require('dc-polyfill')

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)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (039b04e) 82.13% compared to head (0319c1e) 82.11%.

❗ Current head 0319c1e differs from pull request most recent head 66c3ccd. Consider uploading reports for the commit 66c3ccd to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #486      +/-   ##
==========================================
- Coverage   82.13%   82.11%   -0.03%     
==========================================
  Files          54       54              
  Lines        2189     2186       -3     
  Branches      510      509       -1     
==========================================
- Hits         1798     1795       -3     
  Misses        329      329              
  Partials       62       62              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.