Bumping the VTS version for VTS 15. Bug: b/322109170 (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:9569412d3aa629ce442499538a93ff3b67b9597a) Merged-In: Ib837ff2ede2cbd9cf359984f5787bf4234fc55c8 Change-Id: Ib837ff2ede2cbd9cf359984f5787bf4234fc55c8