Re-enable the display-dependency-updates goal

[cwbriones]

The plugin (org.codehaus.mojo:versions-maven-plugin:2.5:display-dependency-updates) was explicitly disabled for this project in #486. This is because of suspected issues with the maven http client within the Github Actions environment.

Once those issues are resolved we need to re-enable this plugin.

[cwbriones]

The initial workaround was introduced in #483 but doesn't seem to help here.