Update gdbstub crate to version 0.6.1 am: 8b36abab0d

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/gdbstub/+/2068507

Change-Id: I27be4edbaa77cdf427146239ceadcf3e6c4779ad
Signed-off-by: Automerger Merge Worker <[email protected]>