Support Sonatype Nexus Repository 3.53.0

[cniweb]

There is a known issue in Sonatype Nexus Repository 3.53.0 impacting those using community or custom plugins. These plugins will not load from the typical install directory and, in some cases, this may prevent Sonatype Nexus Repository from starting.

If you are using community or custom plugins and wish to upgrade, remove the plugin before doing so. Otherwise, wait to upgrade until we release a fix for this issue.

https://help.sonatype.com/repomanager3/product-information/release-notes/2023-release-notes/sonatype-nexus-repository-3.53.0-release-notes

cc @DarthHater @bhamail @l3ender