build(deps): bump google.golang.org/protobuf from 1.33.0 to 1.34.2 in /exporters/otlp/otlptrace/otlptracegrpc

build(deps): bump google.golang.org/protobuf from 1.33.0 to 1.34.2 in /exporters/otlp/otlptrace/otlptracegrpc #178