add changelog entry

Author: dmathieu

CHANGELOG.md

@@ -26,6 +26,8 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Changed
 
 - Improve performance by reducing allocations in the gRPC stats handler in `go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc`. (#8035)
+- The semantic conventions have been upgraded in `go.opentelemetry.io/contrib/instrumentation/go.mongodb.org/mongo-driver/mongo/otelmongo` to `v1.37.0`. (#8230)
+- Switched the default for `OTEL_SEMCONV_STABILITY_OPT_IN` to emit the v1.37.0 semantic conventions by default in `go.opentelemetry.io/contrib/instrumentation/go.mongodb.org/mongo-driver/mongo/otelmongo`. (#8230)
 
 ### Deprecated