fix: explicitly define and export Package subpath './lib/util/namespace'

[Rajpratik71]

On Node 18, "yeoman-environment" package is creating issue due to missing package path export.

Fix https://github.com/jhipster/generator-jhipster/issues/20349

Fix https://github.com/jhipster/generator-jhipster/issues/19627

Signed-off-by: Pratik Raj rajpratik71@gmail.com

[Rajpratik71]

Due to this application, initialization is failing when using Node 18.

Issues reported at

https://github.com/jhipster/generator-jhipster/issues/20349

https://github.com/jhipster/generator-jhipster/issues/19627

[Rajpratik71]

cc @mshima @murukal @martincostello

[mshima]

@Rajpratik71 already fixed in https://github.com/yeoman/environment/pull/430. And updated at jhipster v7 maintainance branch. You can install from git npm install jhipster/generator-jhipster#v7.x_maintenance.