CXX-3042 Update release instructions with suspension note (#1144)

Author: eramongodb

etc/releasing.md

@@ -382,6 +382,9 @@ of the stable release of 3.9.0.
 
 ## Docker Image Build and Publish
 
+> [!IMPORTANT]
+> Docker image publication for new releases is currently suspended. See CXX-3042.
+
 We maintain the docker images found in the
 [mongodb/mongo-cxx-driver](https://hub.docker.com/r/mongodb/mongo-cxx-driver/)
 Docker Hub repo.