Build icing against the "current" SDK for mainline compatibility. am: ac858b3f91 am: cc27da1e76 am: 70f26ac5ad am: 9408b12e2c am: 47e85f0190

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

Change-Id: I0fb9d2356b19b22e1623a99bf5037d5b22d1eb8c