Upgrade proc-macro2 to 1.0.66 am: 5c471c4a5c am: 4801c12b7f

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/proc-macro2/+/2710373

Change-Id: I1989f77738844fc409af5ff825e128c0eec8b48d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>