Update to syn-2 am: ed8925a283 am: 6a66d6d156 am: 7c8a97910f

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

Change-Id: Icc6f91bd9cd09e61484aedb352ac2d18a1e4739b
Signed-off-by: Automerger Merge Worker <[email protected]>