Upgrade gdbstub to 0.7.0 am: 4d46537554

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/gdbstub/+/2878118

Change-Id: Iea99b861d612aadd13e55ae2da20db10aaa9373f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>