Co-Authored-By: NJesse Glick <jglick@cloudbees.com>

Update versions of some detached plugins that installed in some cases when upgrading Jenkins or when implied dependencies are not specified for manually managed plugins. (#4125)

* Update bundled plugins

* Add new dependencies for JUnit, fix test with matrix-auth

* Introduce property for matrix-auth version

* Switch to SpotBugs

* Suppress erroneous NP_PARAMETER_MUST_BE_NONNULL_BUT_MARKED_AS_NULLABLE warnings

* Try replacing Nullable with CheckForNull, per Oleg's suggestion.

* Tidy up SpotBugs annotation reference in POM

* Update core/src/main/java/jenkins/security/apitoken/LegacyApiTokenAdministrativeMonitor.java
Co-Authored-By: NJeff Thompson <37345299+jeffret-b@users.noreply.github.com>

* Update core/src/main/java/jenkins/security/apitoken/LegacyApiTokenAdministrativeMonitor.java
Co-Authored-By: NJeff Thompson <37345299+jeffret-b@users.noreply.github.com>

* Update core/src/main/java/jenkins/security/apitoken/LegacyApiTokenAdministrativeMonitor.java
Co-Authored-By: NJeff Thompson <37345299+jeffret-b@users.noreply.github.com>

* Revert "Try replacing Nullable with CheckForNull, per Oleg's suggestion."

This reverts commit 39ae38e21494524cea17d9a088b366f47c4b33c0.

https://ant.apache.org/