Ignore .git in license testing
Ignore .git in license testing

It might happen that there's a .py file in some ref under .git with
invalid license.

Signed-off-by: Babis Chalios <740f46968515b4d7c75446d3cf18612b4f944307@amazon.es>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker