[BUG] spring-cloud-azure-feature-management still depends on Jackson 2, causing conflicts with Spring Boot 4

The spring-cloud-azure-feature-management module currently still depends on Jackson 2. However, Spring Boot 4 has removed Jackson 2 support and is based on Jackson 3. This leads to classpath conflicts when using Spring Boot 4 together with Jackson 3, as both Jackson 2 and Jackson 3 artifacts are pulled in. As a result, applications may experience runtime issues such as ClassNotFoundException, NoSuchMethodError, or inconsistent serialization behavior. https://github.com/Azure/azure-sdk-for-java/blob/main/sdk/spring/spring-cloud-azure-feature-management/pom.xml#L51 **Expected Behavior:** - The library should be fully compatible with Spring Boot 4. - Jackson 2 dependencies should be removed. - The module should migrate to Jackson 3 APIs. **Actual Behavior:** - Jackson 2 is still included as a dependency. - Conflicts occur when applications use Jackson 3. **Steps to Reproduce:** - Create a Spring Boot 4 project. - Add spring-cloud-azure-feature-management as a dependency. - Use Jackson 3 (default in Spring Boot 4). - Observe dependency conflicts and potential runtime errors.