Fixed DataDog trace exporter

`ddtrace` package introduced some breaking changes that break the
DataDog trace exporter. This commit downgrades the dependency to last
know working version to fix the exporter.

.github/workflows/test.yml

@@ -6,7 +6,7 @@ on:
     - 'release/*'
   pull_request:
 env:
-  CORE_REPO_SHA: f556d1418c8015b71ec2e16b4ba2b76efdd3804f
+  CORE_REPO_SHA: 7054b534404fc69199e368cbe62a4e7570cc46ea
 
 jobs:
   build:

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased](https://github.com/open-telemetry/opentelemetry-python-contrib/compare/v0.19b0...HEAD)
 
 ### Changed
+- Downgrade DataDog exporter's `ddtrace` dependency so the exporter continues to work.
+  ([#400](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/400))
 - GRPC instrumentation now correctly injects trace context into outgoing requests.
   ([#392](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/39))
 - Publish `opentelemetry-propagator-ot-trace` package as a part of the release process

exporter/opentelemetry-exporter-datadog/setup.cfg

@@ -38,7 +38,7 @@ package_dir=
     =src
 packages=find_namespace:
 install_requires =
-    ddtrace>=0.34.0
+    ddtrace>=0.34.0,<0.47.0
     opentelemetry-api == 1.0.0
     opentelemetry-sdk == 1.0.0