This updates Spring Boot tests to accomodate a few deprecated properties in Micrometer 1.5.0 and the new validation API in https://github.com/micrometer-metrics/micrometer/issues/2011.
Fixes test failure seen from the latest Micrometer snapshot in https://ge.spring.io/s/5avby2vzce5qm/tests/failed
cc / @shakuzen @snicoll @wilkinsona