Upgrade Spring Boot version to a supported release

[SergejFrank4242]

Currently, the TeamDojo is using Spring Boot version 2.6.6, which has been out of OSS support for over a year and will also lose Commercial Support in 2 months.

I propose the upgrade of the Spring Boot version to a supported release, considering the following options:

Upgrade to Spring Boot 3.2:
    This is the latest major release of Spring Boot.
    However, please note that upgrading to this version may involve significant changes and potential compatibility issues.

Upgrade to Spring Boot 2.7.x:
    This is the latest stable release within the 2.x version line, which still has Commercial Support available.
    Upgrading to this version would ensure ongoing bug fixes, security patches, and support from the Spring Boot community.

To make an informed decision, the following factors should be considered:

• The level of effort and resources required for each upgrade option.
• The potential impact on the application and any compatibility issues.
• The availability of Commercial Support for the chosen version.

For more information about the End-of-Life (EOL) dates for different Spring Boot versions, please refer to the following link: Spring Boot EOL Dates