Bump images up to Spring Boot 3.4.1 and related dependencies

[TimHess]

Includes the update to SBA for coloring FATAL log level (was added to both 3.3.7 and 3.4.1)

With these dockerfiles, start.spring.io sets these versions in build.gradle:

ext {
  set('springBootAdminVersion', "3.4.1")
  set('springCloudVersion', "2024.0.0")
}

The result for SBA matches that.
Spring Cloud components print logs like Spring Cloud Netflix Eureka Server 4.2.0 by Pivotal Software, Inc.

Commands to test the images from this PR:

docker run --rm -d --pull=always -p 8888:8888 --name steeltoe-config-pr steeltoe.azurecr.io/config-server:pr-41
docker run --rm -d --pull=always -p 8761:8761 --name steeltoe-eureka-pr steeltoe.azurecr.io/eureka-server:pr-41
docker run --rm -d --pull=always -p 9099:9099 --name steeltoe-sbadmin-pr steeltoe.azurecr.io/spring-boot-admin:pr-41