Bump ddtrace from 0.44.0 to 0.50.3

Bumps [ddtrace](https://github.com/DataDog/dd-trace-py) from 0.44.0 to 0.50.3.
- [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@v0.44.0...v0.50.3)

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

Author: dependabot-preview[bot]

poetry.lock

@@ -30,7 +30,7 @@ redis = "*"
 email_validator = "*"
 python-dotenv = "*"
 black = "^20.8b1"
-ddtrace = "^0.44.0"
+ddtrace = "^0.50.3"
 
 [tool.poetry.dev-dependencies]
 black = "^20.8b1"