Use Gson built from source. am: 829619986f am: 6b78ebc76d am: 2ce17ff6ed

Original change: https://android-review.googlesource.com/c/platform/external/android-key-attestation/+/2768647

Change-Id: I7ce626af2769d145f5d95418dd8097574d66b8f1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>