Upgrade rust/crates/combine to 4.6.4 am: 2cc9078f26 am: 60c273cb2a am: 8c290ee734 am: 3f40ec5730

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/combine/+/2137716

Change-Id: I5080ead8ec5e20bc6a3e26997f8d90270a936bbb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>