Update ahash to 0.7.6 am: 0b206a34ff am: 3c86c080a8 am: 7ddeb5744c am: 1319627187

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/ahash/+/2004330

Change-Id: I24577e63d674b3bb4a6d872e337514b6edb52398