chore(main): release auth 0.4.0 (googleapis#10100)

🤖 I have created a release *beep* *boop*
---


## [0.4.0](https://togithub.com/googleapis/google-cloud-go/compare/auth/v0.3.0...auth/v0.4.0) (2024-05-07)


### Features

* **auth:** Enable client certificates by default ([googleapis#10102](https://togithub.com/googleapis/google-cloud-go/issues/10102)) ([9013e52](https://togithub.com/googleapis/google-cloud-go/commit/9013e5200a6ec0f178ed91acb255481ffb073a2c))


### Bug Fixes

* **auth:** Get s2a logic up to date ([googleapis#10093](https://togithub.com/googleapis/google-cloud-go/issues/10093)) ([4fe9ae4](https://togithub.com/googleapis/google-cloud-go/commit/4fe9ae4b7101af2a5221d6d6b2e77b479305bb06))

---
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

@@ -1,6 +1,6 @@
 {
   "aiplatform": "1.67.0",
-  "auth": "0.3.0",
+  "auth": "0.4.0",
   "auth/oauth2adapt": "0.2.2",
   "bigquery": "1.61.0",
   "bigtable": "1.23.0",

auth/CHANGES.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [0.4.0](https://github.com/googleapis/google-cloud-go/compare/auth/v0.3.0...auth/v0.4.0) (2024-05-07)
+
+
+### Features
+
+* **auth:** Enable client certificates by default ([#10102](https://github.com/googleapis/google-cloud-go/issues/10102)) ([9013e52](https://github.com/googleapis/google-cloud-go/commit/9013e5200a6ec0f178ed91acb255481ffb073a2c))
+
+
+### Bug Fixes
+
+* **auth:** Get s2a logic up to date ([#10093](https://github.com/googleapis/google-cloud-go/issues/10093)) ([4fe9ae4](https://github.com/googleapis/google-cloud-go/commit/4fe9ae4b7101af2a5221d6d6b2e77b479305bb06))
+
 ## [0.3.0](https://github.com/googleapis/google-cloud-go/compare/auth/v0.2.2...auth/v0.3.0) (2024-04-23)