fix artifacts resolving as -plain

[codeconsole]

Artifacts should not resolve as -plain unless a Spring boot version is also resolved. It is not proper convention to add -plain classifiers to artifacts.

This could result in unwanted dependency resolution when gradle module files are also distributed.

   136374  10-11-2024 20:07   BOOT-INF/lib/asset-pipeline-grails-4.5.1-plain.jar
   330271  10-10-2024 05:31   BOOT-INF/lib/gsp-6.2.2-plain.jar
    46996  10-10-2024 05:31   BOOT-INF/lib/sitemesh2-6.2.2-plain.jar
    58173  10-11-2024 20:07   BOOT-INF/lib/hibernate5-8.1.0-plain.jar
   144196  10-10-2024 05:33   BOOT-INF/lib/fields-5.1.0-plain.jar