Upgrade pest to 2.5.1 am: 170479099b am: 902986e307

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/pest/+/2345754

Change-Id: I3c460e7577c3038a760265f92f7b64f0ec557e9e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>