chore(main): release 1.29.0 (#471)

Author: release-please[bot]

CHANGELOG.md

@@ -2,6 +2,13 @@
 
  * [feat]: add support for Firebase v6.0 (#391)
 
+## [1.29.0](https://github.com/googleapis/google-auth-library-php/compare/v1.28.0...v1.29.0) (2023-08-22)
+
+
+### Features
+
+* Check unix residency for gce when ping fails ([#469](https://github.com/googleapis/google-auth-library-php/issues/469)) ([3c672f9](https://github.com/googleapis/google-auth-library-php/commit/3c672f9aff61529f4af836558caa50fa29fb9447))
+
 ## [1.28.0](https://github.com/googleapis/google-auth-library-php/compare/v1.27.0...v1.28.0) (2023-05-11)