Clean up code for older Spring Boot versions #1714
Description
e.g.
@Bean
@ConditionalOnPlatformVersion("[2.2.0.M5,2.4.0-SNAPSHOT)")
public BuildCustomizer<Build> junit5TestStarterContributor() {{{ message }}
e.g.
@Bean
@ConditionalOnPlatformVersion("[2.2.0.M5,2.4.0-SNAPSHOT)")
public BuildCustomizer<Build> junit5TestStarterContributor() {