chore(main): release pubsub 1.51.0 (#20162)

🤖 I have created a release *beep* *boop*
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## [1.51.0](https://togithub.com/googleapis/google-cloud-go/compare/pubsub/v1.50.4...pubsub/v1.51.0) (2026-07-15)


### Features

* **o11y:** Regenerate clients for LRO tracing ([#20107](https://togithub.com/googleapis/google-cloud-go/issues/20107)) ([779074e](https://togithub.com/googleapis/google-cloud-go/commit/779074edd267a26520bae459307660953129eb07))

---
This PR was generated with [Release Please](https://togithub.com/googleapis/release-please). See [documentation](https://togithub.com/googleapis/release-please#release-please).

Author: release-please[bot]

.release-please-individual-manifest.json

@@ -7,7 +7,7 @@
   "compute/metadata": "0.9.0",
   "datastore": "1.25.0",
   "firestore": "1.24.0",
-  "pubsub": "1.50.4",
+  "pubsub": "1.51.0",
   "pubsub/v2": "2.6.1",
   "pubsublite": "1.10.0",
   "spanner": "1.92.0",

librarian.yaml

@@ -1077,7 +1077,7 @@ libraries:
       - README.md
       - internal/version.go
   - name: pubsub
-    version: 1.50.4
+    version: 1.51.0
     keep:
       - README.md
       - internal/version.go

pubsub/CHANGES.md

@@ -1,5 +1,12 @@
 # Changes
 
+## [1.51.0](https://github.com/googleapis/google-cloud-go/compare/pubsub/v1.50.4...pubsub/v1.51.0) (2026-07-15)
+
+
+### Features
+
+* **o11y:** Regenerate clients for LRO tracing ([#20107](https://github.com/googleapis/google-cloud-go/issues/20107)) ([779074e](https://github.com/googleapis/google-cloud-go/commit/779074edd267a26520bae459307660953129eb07))
+
 ## [1.50.4](https://github.com/googleapis/google-cloud-go/compare/pubsub/v1.50.3...pubsub/v1.50.4) (2026-07-08)