Gson version preventing Spring Upgrade

[SkylarWolfLA]

This PR is a step in the right direction
#78

but the latest Spring Boot needs 2.11.0

This is preventing us from upgrading and we are considering removing the Sailthru API client from our project as a result.

[francodv]

Here’s where Spring Boot introduced the upgrade: Spring Boot 3.4.0-M1 Release Notes. It’s now a dependency in Spring Boot 3.4.1, which is the version we need to adopt.