Relax datadog version requirement (#231)

Because the datadog package version is 0.x.y, `^0.41.0` is equivalent to
`>= 0.41.0 <0.42.0` [1].

This currently locks the version to `0.41.y`.

Newer versions of `datadog` have been released with minor changes
(currently 0.44.0), but depending on this project prevents pulling them
in.

[1]: https://python-poetry.org/docs/dependency-specification/

Author: alindeman

poetry.lock

@@ -24,7 +24,7 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = ">=3.6.0,<4"
-datadog = "^0.41.0"
+datadog = "^0.41"
 wrapt = "^1.11.2"
 ddtrace = "^0.61.1"
 importlib_metadata = {version = "^1.0", python = "<3.8"}