[releng] Switch to Spring Boot 3.4.1

[sbegaudeau]

Signed-off-by: Stéphane Bégaudeau [email protected]

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[sbegaudeau]

I've been able to pinpoint the issue thanks to this log message:

o.s.w.s.resource.ResourceHandlerUtils    : Appended trailing slash to static resource location: classpath:/static/index.html/

The change in behavior is coming from this issue, the way we redirect to static resources in SpringWebMvcConfigurer does not seems to be valid. It has always been a bit tricky so I'm not entirely surprised by this.

I'll continue looking into this to find how to fix that.