Add SPDX license headers to workflow files

Included appropriate SPDX headers to ensure clear licensing information in both CodeQL and Dependabot workflow files. This improves compliance and transparency across the repository.

.github/dependabot.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2024 Winni Neessen <[email protected]>
+#
+# SPDX-License-Identifier: CC0-1.0
+
 version: 2
 updates:
   - package-ecosystem: github-actions

.github/workflows/codeql.yml

@@ -1,14 +1,7 @@
-# For most projects, this workflow file will not need changing; you simply need
-# to commit it to your repository.
-#
-# You may wish to alter this file to override the set of languages analyzed,
-# or to provide custom queries or build logic.
-#
-# ******** NOTE ********
-# We have attempted to detect the languages in your repository. Please check
-# the `language` matrix defined below to confirm you have the correct set of
-# supported CodeQL languages.
+# SPDX-FileCopyrightText: 2024 Winni Neessen <[email protected]>
 #
+# SPDX-License-Identifier: CC0-1.0
+
 name: "CodeQL"
 
 on: