[automerger skipped] Update androidx build sdk to 30 instead of current am: b7662ef116 -s ours

am skip reason: Merged-In I4a9139774d0afb03ad3d6a008f51f9e4a172df91 with SHA-1 8e84b6102f is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/prebuilts/sdk/+/14338721

Change-Id: Ib0c9e1c36acaf47a262445c3612983164d5d51aa