Use Jackson 3 in Spring Cloud Azure 7.x to align with Spring Boot 4

[MelleD]

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.

[github-actions]

@moarychan @Netyyyy @rujche @saragluna

[github-actions]

Thank you for your feedback. Tagging and routing to the team member best able to assist.