Update proc-macro2 to v1.0.69 am: 3def4a0b2b am: 14045e9f5d am: a0645dd6b3

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

Change-Id: I0659c6c155b68514bdd93321646b361c0a89792e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>