Upgrade plotters-backend to 0.3.4 am: 9bbb63e272 am: d66cdd7ef4 am: 021ff2154b

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/plotters-backend/+/2348425

Change-Id: I8c4c8c92671f4f805600f42cfb75c16f404203e6
Signed-off-by: Automerger Merge Worker <[email protected]>