Update link about app configuration sample. (Azure#29144)

Author: rujche

sdk/appconfiguration/azure-spring-cloud-feature-management/README.md

@@ -274,4 +274,4 @@ Options are available to customize how targeting evaluation is performed across
 ## Contributing
 
 <!-- Links -->
-[example_project]: https://github.com/Azure-Samples/azure-spring-boot-samples/tree/tag_azure-spring-boot_3.6.0/appconfiguration/feature-management-web-sample
+[example_project]: https://github.com/Azure-Samples/azure-spring-boot-samples/tree/spring-cloud-azure_v4.2.0/appconfiguration/feature-management-web-sample

sdk/appconfiguration/azure-spring-cloud-starter-appconfiguration-config/README.md

@@ -336,9 +336,9 @@ Please follow [instructions here][contributing_md] to build from source or contr
 
 <!-- Link -->
 [package]: https://mvnrepository.com/artifact/com.microsoft.azure/spring-cloud-azure-appconfiguration-config
-[app_configuration_sample]: https://github.com/Azure-Samples/azure-spring-boot-samples/tree/tag_azure-spring-boot_3.6.0/appconfiguration/azure-appconfiguration-sample
-[app_configuration_conversation_complete_sample]: https://github.com/Azure-Samples/azure-spring-boot-samples/tree/tag_azure-spring-boot_3.6.0/appconfiguration/azure-appconfiguration-conversion-sample-complete
-[app_configuration_conversation_initail_sample]: https://github.com/Azure-Samples/azure-spring-boot-samples/tree/tag_azure-spring-boot_3.6.0/appconfiguration/azure-appconfiguration-conversion-sample-initial
+[app_configuration_sample]: https://github.com/Azure-Samples/azure-spring-boot-samples/tree/spring-cloud-azure_v4.2.0/appconfiguration/azure-appconfiguration-sample
+[app_configuration_conversation_complete_sample]: https://github.com/Azure-Samples/azure-spring-boot-samples/tree/spring-cloud-azure_v4.2.0/appconfiguration/azure-appconfiguration-conversion-sample-complete
+[app_configuration_conversation_initail_sample]: https://github.com/Azure-Samples/azure-spring-boot-samples/tree/spring-cloud-azure_v4.2.0/appconfiguration/azure-appconfiguration-conversion-sample-initial
 [azure_subscription]: https://azure.microsoft.com/free
 [spring logging document]: https://docs.spring.io/spring-boot/docs/current/reference/html/features.html#boot-features-logging
 [contributing_md]: https://github.com/Azure/azure-sdk-for-java/tree/main/sdk/spring/CONTRIBUTING.md