chore(main): release auth 0.9.0 (#10693)

🤖 I have created a release *beep* *boop*
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## [0.9.0](https://togithub.com/googleapis/google-cloud-go/compare/auth/v0.8.1...auth/v0.9.0) (2024-08-16)


### Features

* **auth:** Auth library can talk to S2A over mTLS ([#10634](https://togithub.com/googleapis/google-cloud-go/issues/10634)) ([5250a13](https://togithub.com/googleapis/google-cloud-go/commit/5250a13ec95b8d4eefbe0158f82857ff2189cb45))

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

.release-please-manifest-individual.json

@@ -1,7 +1,7 @@
 {
  "ai": "0.8.2",
  "aiplatform": "1.68.0",
- "auth": "0.8.1",
+ "auth": "0.9.0",
  "auth/oauth2adapt": "0.2.4",
  "bigquery": "1.62.0",
  "bigtable": "1.29.0",

auth/CHANGES.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.9.0](https://github.com/googleapis/google-cloud-go/compare/auth/v0.8.1...auth/v0.9.0) (2024-08-16)
+
+
+### Features
+
+* **auth:** Auth library can talk to S2A over mTLS ([#10634](https://github.com/googleapis/google-cloud-go/issues/10634)) ([5250a13](https://github.com/googleapis/google-cloud-go/commit/5250a13ec95b8d4eefbe0158f82857ff2189cb45))
+
 ## [0.8.1](https://github.com/googleapis/google-cloud-go/compare/auth/v0.8.0...auth/v0.8.1) (2024-08-13)