Use webjar versions from grails-bom

Requires https://github.com/grails/grails-core/pull/13944

```
    developmentOnly "org.webjars.npm:bootstrap:5.3.3"
    developmentOnly "org.webjars.npm:bootstrap-icons:1.11.3"
    developmentOnly "org.webjars.npm:jquery:3.7.1"
```