Upgrade pest_generator to 2.7.6 am: eb05b04b69

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/pest_generator/+/2949318

Change-Id: I200b2f08ce75e22e1f2bb03d31c31e6d2bccb300
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>