Replaced tags with pinned sha for check-license-headers GH action

Author: fabapp2

.github/workflows/check-license-headers.yml

@@ -9,6 +9,6 @@ jobs:
   check-license-lines:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 # pin@v3
       - name: Check License Lines
-        uses: kt3k/[email protected]
+        uses: kt3k/license_checker@d12a6d90c58e30fefed09f2c4d03ba57f4c673a8 # pin@v1.0.6