Copybara import of the project:

--
978c946 by Matt Dziuban <mrdziuban@gmail.com>:

fix: Use `orElseGet` to defer loading of default credentials.
COPYBARA_INTEGRATE_REVIEW=#124 from mrdziuban:fix-default-credentials 978c946
PiperOrigin-RevId: 743689191

Author: mrdziuban

src/main/java/com/google/genai/ApiClient.java

@@ -104,7 +104,7 @@ abstract class ApiClient {
       throw new IllegalArgumentException("Location must not be empty.");
     }
 
-    this.credentials = Optional.of(credentials.orElse(defaultCredentials()));
+    this.credentials = Optional.of(credentials.orElseGet(() -> defaultCredentials()));
 
     this.httpOptions = defaultHttpOptions(/* vertexAI= */ true, this.location);