feat: bump ddtrace to 4.x (breaking change)

[astuyve]

What does this PR do?

This library is dropping support for node14, so we can now upgrade ddtrace to 4.x

Motivation

Testing Guidelines

Additional Notes

Types of Changes

• [ ] Bug fix
• [ ] New feature
• [x] 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 :white_check_mark:

Comparison is base (0fe831a) 82.11% compared to head (181e468) 82.11%.

:exclamation: Current head 181e468 differs from pull request most recent head 7adccb0. Consider uploading reports for the commit 7adccb0 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #487 +/- ## ======================================= Coverage 82.11% 82.11% ======================================= Files 54 54 Lines 2186 2186 Branches 509 509 ======================================= Hits 1795 1795 Misses 329 329 Partials 62 62 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.