deps: update dependency com.google.cloud:google-cloud-pubsub to v1.124.0 (#1472)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-pubsub](https://togithub.com/googleapis/java-pubsub) | `1.123.20` -> `1.124.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-pubsub/1.124.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-pubsub/1.124.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-pubsub/1.123.20/1.124.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-pubsub/1.123.20/1.124.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-pubsub (com.google.cloud:google-cloud-pubsub)</summary>

### [`v1.124.0`](https://togithub.com/googleapis/java-pubsub/blob/HEAD/CHANGELOG.md#11240-2023-07-27)

[Compare Source](https://togithub.com/googleapis/java-pubsub/compare/v1.123.20...v1.124.0)

##### Features

-   Setup 1.123.x lts branch ([#&#8203;1676](https://togithub.com/googleapis/java-pubsub/issues/1676)) ([a60b887](https://togithub.com/googleapis/java-pubsub/commit/a60b88772d69d367f90bbe61bc4e157338193b0f))

##### Documentation

-   Clarified where ordering_key will be written if write_metadata is set ([#&#8203;1675](https://togithub.com/googleapis/java-pubsub/issues/1675)) ([462746c](https://togithub.com/googleapis/java-pubsub/commit/462746cfbf9b712118b67349f2f4f4cebf45932a))

</details>

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