Compatible workaround to support both protobuf <=3.20 and >=4.21

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/compare/v1.13.0-0.34b0...HEAD)
 
+- Compatible workaround to support both protobuf <=3.20 and >=4.21
+  ([#2954](https://github.com/open-telemetry/opentelemetry-python/pull/2947))
 - Update explicit histogram bucket boundaries
   ([#2947](https://github.com/open-telemetry/opentelemetry-python/pull/2947))
 

dev-requirements.txt

@@ -10,9 +10,9 @@ sphinx-autodoc-typehints~=1.12.0
 pytest>=6.0
 pytest-cov>=2.8
 readme-renderer~=24.0
-grpcio-tools~=1.41.0
-mypy-protobuf~=3.0.0
-protobuf~=3.18.1
+grpcio-tools>=1.41.0
+mypy-protobuf>=3.0.0
+protobuf>=3.18.1
 # temporary fix. we should update the jinja, flask deps
 # See https://github.com/pallets/markupsafe/issues/282
 # breaking change introduced in markupsafe causes jinja, flask to break