Use Gson built from source. am: 829619986f am: 6b78ebc76d am: 2ce17ff6ed am: 655935d625 am: c6b6166052

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

Change-Id: I331ece934bdb85d8274f68908ecc4760ef5b6a7f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>