Update protobuf requirement from <=3.20.1 to <4.21.3 (#8346)

Updates the requirements on [protobuf](https://github.com/protocolbuffers/protobuf) to permit the latest version. - [Release notes](https://github.com/protocolbuffers/protobuf/releases) - [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py) - [Commits](https://github.com/protocolbuffers/protobuf/commits) --- updated-dependencies: - dependency-name: protobuf dependency-type: direct:production ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

Update protobuf requirement from <=3.20.1 to <4.21.3 (#8346)
50ff6eee · dependabot[bot] · GitHub · 34df5032 · 50ff6eee
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ scipy>=1.4.1  # Google Colab version
 torch>=1.7.0
 torchvision>=0.8.1
 tqdm>=4.41.0
-protobuf<=3.20.1  # https://github.com/ultralytics/yolov5/issues/8012
+protobuf<4.21.3  # https://github.com/ultralytics/yolov5/issues/8012

 # Logging -------------------------------------
 tensorboard>=2.4.1