Revert back to 2.28.5

git revert v2.28.5..v2.28.6
git rebase to combine the resulting revert commits

This reverts commit 3a91dad9dceb484eea8b41f8941facafc4520021.
diff --git a/tests/scripts/test_config_script.py b/tests/scripts/test_config_script.py
index c835b1c..8ca4103 100755
--- a/tests/scripts/test_config_script.py
+++ b/tests/scripts/test_config_script.py
@@ -14,8 +14,19 @@
 """
 
 ## Copyright The Mbed TLS Contributors
-## SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+## SPDX-License-Identifier: Apache-2.0
 ##
+## Licensed under the Apache License, Version 2.0 (the "License"); you may
+## not use this file except in compliance with the License.
+## You may obtain a copy of the License at
+##
+## http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+## WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
 
 import argparse
 import glob