bump dd-trace v6

[ojproductions]

What does this PR do?

Bumps dd-trace v6 to most recent version. This is to include the new cold start improvements.

Motivation

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)

[ojproductions]

@joeyzhao2018 do these fixtures also need to be updated too? Or does it get overrode in the dockerfile/run scripts?

[joeyzhao2018]

i think the script today only updates v5... I actually think we should also make the script update v6 too

[ojproductions]

ok I thought so. I'm working to remove these pins right now, so they use the root ddtrace version

[purple4reina]

Can we get a better PR description and title on this? I'm unsure why you say you're starting a release but then see you bumping the ddtrace version. Why does this version need to be changed?

[ojproductions]

@purple4reina, @joeyzhao2018 mentioned there were some cold start improvements in the most recent dd-trace release, and we wanted to get it out in this lambda release. It's not critical, we can do it in the next release.