[JENKINS-68462] Prepare LDAP for removal of JAXB and Java 11 requirement

[basil]

See JENKINS-68462. The current version of this plugin bundles an old version of spring-ldap-core, which requires JAXB. When we start requiring Java 11, JAXB will not be available except as a plugin-to-plugin dependency (which this plugin does not have). In spring-projects/spring-ldap#590 spring-ldap-core 2.3.5 and later stopped requiring JAXB. This PR updates the core baseline to 2.332.x, which pulls in a newer version of spring-security-bom, which pulls in spring-ldap-core 2.3.5 (2.303.x pulls in 2.3.4, sadly). Thus with this update we start shipping spring-ldap-core 2.3.5 which no longer depends on JAXB, and thus we are assured of a smooth upgrade for users when we start requiring Java 11.

Testing done

$ mvn clean verify
[…]
[INFO] Assembling webapp ldap in ldap-plugin/target/ldap
[INFO] Bundling direct dependency time4j-base-5.8.jar
[INFO] Bundling direct dependency time4j-tzdata-5.0-2021e.jar
[WARNING] Bundling transitive dependency spring-ldap-core-2.3.5.RELEASE.jar (via spring-security-ldap)
[INFO] Bundling direct dependency spring-security-ldap-5.6.1.jar
[WARNING] Bundling transitive dependency spring-tx-5.3.14.jar (via spring-security-ldap)
[INFO] Generating hpi ldap-plugin/target/ldap.hpi
[INFO] Building jar: ldap-plugin/target/ldap.hpi
[…]
$

[basil]

CC @olamy