Bump ddtrace from 0.50.3 to 0.51.1

Bumps [ddtrace](https://github.com/DataDog/dd-trace-py) from 0.50.3 to 0.51.1.
- [Release notes](https://github.com/DataDog/dd-trace-py/releases)
- [Changelog](https://github.com/DataDog/dd-trace-py/blob/master/CHANGELOG.md)
- [Commits](DataDog/dd-trace-py@v0.50.3...v0.51.1)

---
updated-dependencies:
- dependency-name: ddtrace
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

poetry.lock

@@ -30,7 +30,7 @@ redis = "*"
 email_validator = "*"
 python-dotenv = "*"
 black = "^20.8b1"
-ddtrace = "^0.50.3"
+ddtrace = "^0.51.1"
 
 [tool.poetry.dev-dependencies]
 black = "^20.8b1"