Bumps [gopkg.in/DataDog/dd-trace-go.v1](https://github.com/DataDog/dd-trace-go) from 1.20.1 to 1.21.0.
- [Release notes](https://github.com/DataDog/dd-trace-go/releases)
- [Commits](https://github.com/DataDog/dd-trace-go/compare/v1.20.1...v1.21.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>