fix: add missing exception cause in createSecretManagerClient (#1923)

spring-cloud-gcp-autoconfigure/src/main/java/com/google/cloud/spring/autoconfigure/secretmanager/SecretManagerConfigDataLocationResolver.java

@@ -122,7 +122,7 @@ static synchronized SecretManagerServiceClient createSecretManagerClient(
       return secretManagerServiceClient;
     } catch (IOException e) {
       throw new RuntimeException(
-          "Failed to create the Secret Manager Client for ConfigData loading.");
+          "Failed to create the Secret Manager Client for ConfigData loading.", e);
     }
   }