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 <[email protected]>

Author: bchalios

tests/integration_tests/style/test_licenses.py

@@ -23,7 +23,7 @@
 ALIBABA_COPYRIGHT = "Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved."
 ALIBABA_LICENSE = "SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause"
 
-EXCLUDE = ["build", ".kernel"]
+EXCLUDE = ["build", ".kernel", ".git"]
 
 
 def _has_amazon_copyright(string):