build/Dependencies.props: Added reminder to lock down the ICU4N package dependency version when it is stable. The Lucene.Net.ICU resources are not compatible with versions of ICU other than 60.1.
build/Dependencies.props: Added reminder to lock down the ICU4N package dependency version when it is stable. The Lucene.Net.ICU resources are not compatible with versions of ICU other than 60.1.

jeme/lucenenet,apache/lucenenet,apache/lucenenet,sisve/lucenenet,NightOwl888/lucenenet,jeme/lucenenet,apache/lucenenet,NightOwl888/lucenenet,sisve/lucenenet,NightOwl888/lucenenet,jeme/lucenenet,jeme/lucenenet,apache/lucenenet,NightOwl888/lucenenet