Downgrade CI testing for 2.7.x.

Spring Data JPA 2.7.x doesn't work very well on Java 20 without several other changes so we're downgrading CI testing to Java 8/11/17.

See #3031

ci/pipeline.properties

@@ -1,7 +1,7 @@
 # Java versions
 java.main.tag=8u382-b05-jdk-focal
-java.next.tag=20-jdk-jammy
-java.lts.tag=17.0.8_7-jdk-focal
+java.next.tag=11.0.18_10-jdk-focal
+java.lts.tag=17.0.7_7-jdk-focal
 
 # Docker container images - standard
 docker.java.main.image=harbor-repo.vmware.com/dockerhub-proxy-cache/library/eclipse-temurin:${java.main.tag}