enforce urllib3 version (#335)

Author: joeyzhao2018

pyproject.toml

@@ -27,6 +27,7 @@ python = ">=3.7.0,<4"
 datadog = ">=0.41.0,<1.0.0"
 wrapt = "^1.11.2"
 ddtrace = "^1.6.4"
+urllib3 = "<2.0.0"
 importlib_metadata = {version = "^1.0", python = "<3.8"}
 boto3 = { version = "^1.10.33", optional = true }
 typing_extensions = {version = "^4.0", python = "<3.8"}