Infinispan depends on a newer version of jboss-threads.
wildfly-core still uses 2.4.0, and is preventing this upgrade.
jboss-threads 3.6.x is the last branch that uses wildfly-common. Later branches use smallrye-common.

https://github.com/jbossas/jboss-threads/releases/tag/3.5.0.Final
https://github.com/jbossas/jboss-threads/releases/tag/3.6.0.Final
https://github.com/jbossas/jboss-threads/releases/tag/3.6.1.Final