Pin actions/checkout to v6.0.2 SHA and fix license headers

Pin actions/checkout in check-project-actions.yml to the same SHA used
across the rest of the repo (de0fac2e4500dabe0009e67214ff5f5447ce83dd,
v6.0.2) so zizmor's unpinned-uses audit passes.

In gateway/check_repository_actions.py, move the existing Apache license
header above the PEP 723 script block so pre-commit's insert-license
hook detects it (it only scans the first few lines). Add a missing
Apache license header to utils/actions-audit.py.

Generated-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: potiuk

.github/workflows/check-project-actions.yml

@@ -67,13 +67,13 @@ jobs:
       contents: read
     steps:
       - name: "Checkout apache/infrastructure-actions"
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
         with:
           repository: 'apache/infrastructure-actions'
           ref: 'main'
 
       - name: "Checkout repository to be checked"
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
         with:
           repository: '${{ inputs.repository }}'
           ref: ${{ inputs.ref }}

gateway/check_repository_actions.py

@@ -1,9 +1,3 @@
-# /// script
-# requires-python = ">=3.13"
-# dependencies = [
-#     "ruyaml",
-# ]
-# ///
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file
@@ -22,7 +16,13 @@
 # specific language governing permissions and limitations
 # under the License.
 #
-#
+
+# /// script
+# requires-python = ">=3.13"
+# dependencies = [
+#     "ruyaml",
+# ]
+# ///
 
 import fnmatch
 import os

utils/actions-audit.py

@@ -1,3 +1,22 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+#
+
 # /// script
 # requires-python = ">=3.11"
 # dependencies = [