Upgrade async-stream to 0.3.4 am: 4b13b9fde6 am: f675554708 am: 6c2c412e88

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/async-stream/+/2467320

Change-Id: I8f875e79b555b0af1578fa02367b78170924ed66
Signed-off-by: Automerger Merge Worker <[email protected]>