Bump google.golang.org/grpc from 1.32.0 to 1.34.0 in /example/otel-co…

…llector (#1400)

* Bump google.golang.org/grpc in /example/otel-collector

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.32.0 to 1.34.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.32.0...v1.34.0)

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* Auto-fix go.sum changes in dependent modules

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