Update LayerZero submodule & remove exec bits

Normalize file permissions and advance submodule: change file modes from executable (100755) to non-executable (100644) for deploy/execute_config.sh, deploy/verify_config.sh, and prep/check-bytecode-changes.js. Update lib/LayerZero-v2 submodule commit from 88428755be6caa71cb1d2926141d73c8989296b5 to ab9b083410b9359285a5756807e1b6145d4711a7.

Author: googleworkspace-bot