Update proc-macro2 to v1.0.69 am: 3def4a0b2b

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/proc-macro2/+/2786435

Change-Id: Id82d177995c69614a580467f5cf33848c25e22e9
Signed-off-by: Automerger Merge Worker <[email protected]>