Fix tracing-opentelemetry-deps dependency

Still seeing problems:

This class turns out to be in a different jar than the one I added. The full list of dependencies for io.opentelemetry.instrumentation:opentelemetry-grpc-1.6 is:

io.opentelemetry:opentelemetry-api
io.opentelemetry.instrumentation:opentelemetry-instrumentation-api
io.opentelemetry.instrumentation:opentelemetry-instrumentation-api-semconv

So, we should be able to add a dependency on the latter to get past this issue (as we are intentionally added all dependencies of io.opentelemetry.instrumentation:opentelemetry-grpc-1.6 to tracing-opentelemetry, following discussion here.