Add SPDX header to github actions

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

.github/workflows/autoApproveDependabot.yml

@@ -1,3 +1,6 @@
+ * SPDX-FileCopyrightText: 2020-2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2020 Tobias Kaminsky <tobias@kaminsky.me>
+ * SPDX-License-Identifier: GPL-3.0-or-later
 name: Dependabot
 on: pull_request_target
 

.github/workflows/gradle-wrapper-validation.yml

@@ -1,3 +1,6 @@
+ * SPDX-FileCopyrightText: 2022-2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2022 Unpublished <unpublished@users.noreply.github.com>
+ * SPDX-License-Identifier: GPL-3.0-or-later
 name: "Validate Gradle Wrapper"
 
 on: