Build icing against the "current" SDK for mainline compatibility. am: ac858b3f91 am: 560a0dde72 am: 1ab6167170 am: 6cba7ec888

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/icing/+/14804613

Change-Id: I46b9e60e85e513c1b2625752fd37586770bdf78c