Throws InvalidTransitionException

So far, InvalidTransitionException was a subclass of IOException. After
Ic06b8877, this is no longer the case and the exception needs to be
explicitly added to the method signature.

Depends-on: https://gerrit-review.googlesource.com/c/plugins/its-base/+/145030
Change-Id: I4af743fc8f8bf796904d02152e2a5e70e2984bd4