Add support for spring-boot 4

[DenuxPlays]

Hey,

would be nice to have support for the newly released spring-boot 4.

[freya022]

I'll look into it, unsure yet if this should be upgraded (as it could be an issue for larger projects), I think I should test for compatibility, in which case you are free to override the versions used. As a reminder, you are encouraged to declare the dependencies you explicitly use in your code, to avoid relying on transitive dependencies you don't control.

[freya022]

Reviewing the Spring Boot 4 migration guide shows no compatibility issue, and running a test bot with it works too.

You should be able to use it fine, you only have to add Spring Boot 4 and it should override the dependencies to use the latest ones. (at least when using Gradle)

Please close the issue if this works for you.