Update to syn-2 am: ed8925a283 am: 6a66d6d156

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/tracing-attributes/+/2523895

Change-Id: Ib0890ed93cb7a302303d1a14a1dbb476a28be952
Signed-off-by: Automerger Merge Worker <[email protected]>