Confirm works under spring-boot 3.4.x and fix any regressions or deprecations.

The upgrade to spring-boot 3.4 is necessary to be in line with the Officially Supported Technologies for Sunflower and Trillium.

see: https://github.com/folio-org/spring-module-core/pull/74

These now appear:

There also appears to be major bean matching problems now.
Brief snippet of a couple (There are a lot more than this):

There are @MockBean and @SpyBean deprecation warnings.
The @MockBean must be replaced with @MockitoBean.
The @SpyBean must be replaced with @MockitoSpyBean.

see: https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.4-Release-Note