Release Google.Events.Protobuf version 1.0.0-beta05
Release Google.Events.Protobuf version 1.0.0-beta05

Changes since 1.0.0-beta04:

- Updated to CloudNative.CloudEvents version 2.0.0-rc.1
- ProtobufJsonCloudEventFormatter signatures updated accordingly
  to use `ReadOnlyMemory<byte>`

googleapis/google-cloudevents-dotnet,googleapis/google-cloudevents-dotnet