Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

…v1 to v2.73.0 (googleapis#2189)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.api.grpc:proto-google-cloud-trace-v1](https://redirect.github.com/googleapis/google-cloud-java) | `2.72.0` -> `2.73.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.api.grpc:proto-google-cloud-trace-v1/2.73.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.api.grpc:proto-google-cloud-trace-v1/2.73.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.api.grpc:proto-google-cloud-trace-v1/2.72.0/2.73.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.api.grpc:proto-google-cloud-trace-v1/2.72.0/2.73.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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