autobot: Wrap message body within 72 columns

Commit messages for this repo should follow our commit message style
guide. This means message bodies should be wrapped within 72 columns.
Use textwrap to wrap autobot's commit messages, so that autobot-composed
commits won't fail our gitlint checks due to having too long of lines in
autobot's commit messages.

    3: B1 Line exceeds max length (90>72): "Update mcu-driver-reference-platforms-for-arm to 4becb3175d518c7f691f19b57bc1489adb6c4421."

Signed-off-by: Jaeden Amero <jaeden.amero@arm.com>