Merge "Upgrade rust/crates/syn to 1.0.40" am: 8e5f574385 am: 8765c5d726 am: 8bf7812b3d am: ffaa2679de am: 8d83503124

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/syn/+/1422383

Change-Id: I1e6c4b2f509d6af51f438f637a34d4ed90260ba2