TrafficCommandUpdate missing from CMakeLists

[ClemensLinnhoff]

Describe the bug

The TrafficCommantUpdate defined in osi_trafficcommandupdate.proto, introduced in #615, is missing from the CMakeLists. Therefore, no corresponding C++ header is build.

Describe how to reproduce the bug

Steps to reproduce the behavior:

1. Build OSI as described here
2. Go to the build folder and see that there is no osi_trafficcommandupdate.pb.h

Describe the expected behavior

For every proto file, there has to be a corresponding header.

Describe the OS you are using

• OS: Ubuntu 22.04
• Language: C++
• Version 3.6.0