AbstractJpaVendorAdapter refers to JPA 2.1 but requires JPA 3.0

[wilkinsona]

Affects: 6.0 snapshots

AbstractJpaVendorAdapter refers to JPA 2.1 but it now requires JPA 3.0. Similarly, HibernateJpaVendorAdapter describes support for Hibernate 5.2, 5.3, and 5.4. I believe it now requires a minimum of 5.5 as that's the earliest version that has -jakarta variants of its modules and supports JPA 3.0.