Update parent pom reference to version 4.1.0.Alpha2-SNAPSHOT

Update to the latest version. We had 4.1.0.Alpha1-SNAPSHOT which
recently stopped working because it points to now non-existent
TP 4.30.5.Alpha-SNAPSHOT. We should be using parent
4.1.0.Alpha2-SNAPSHOT until 4.1.0.Alpha2 is released and then
we'll move to that.