Pin ddtrace to <v4 (#563)

Author: purple4reina

pyproject.toml

@@ -28,7 +28,7 @@ classifiers = [
 python = ">=3.8.0,<4"
 datadog = ">=0.51.0,<1.0.0"
 wrapt = "^1.11.2"
-ddtrace = ">=2.20.0"
+ddtrace = ">=2.20.0,<4"
 ujson = ">=5.9.0"
 boto3 = { version = "^1.34.0", optional = true }
 requests = { version ="^2.22.0", optional = true }