build: relax datadog version (#290)

It seems to me that the version is not intentionally locked to the range >= 0.41, < 0.42, and it is more a matter of the fact that poetry treats versions that start with `0` differently when using `^` ([docs](https://python-poetry.org/docs/dependency-specification/#caret-requirements))

Related issue:
- #253

Releases of the `datadog` lib (it looks to me that there is no risk):
- https://github.com/DataDog/datadogpy/releases

Author: filip-halemba

pyproject.toml

@@ -23,7 +23,7 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = ">=3.7.0,<4"
-datadog = "^0.41"
+datadog = ">=0.41.0,<1.0.0"
 wrapt = "^1.11.2"
 ddtrace = "^1.6.4"
 importlib_metadata = {version = "^1.0", python = "<3.8"}