Update main.yml

Signed-off-by: Andreas Fehlner <fehlner@arcor.de>

Author: andife

.github/workflows/main.yml

@@ -1,9 +1,13 @@
+# Copyright (c) ONNX Project Contributors
+#
+# SPDX-License-Identifier: Apache-2.0
+
 name: linting-actions
 on: [push, pull_request]
 jobs:
   json-linter:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: json-lint
         uses: ocular-d/json-linter@0.0.2