CI: update the zephyr submodule to grab HEAD

Always using HEAD will help us detect errors faster instead of when we
manually update to a new SHA.

Change-Id: I1730a7a6f62939d1f9023827755466142efcb4a6
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/100441
Commit-Queue: Yuval Peress <peress@google.com>
Reviewed-by: Rob Mohr <mohrr@google.com>
2 files changed
tree: 3e54f53b4e8e6b831e9076e1b2aaed06078e51bc
  1. .gitmodules
  2. test.sh