Upgrade gdbstub to 0.7.1 am: 7f141cdbcf am: e35c739188

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/gdbstub/+/2944166

Change-Id: I34a82c63ff1bdd8e59889db659ba4317dfc63479
Signed-off-by: Automerger Merge Worker <[email protected]>