Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
         # Build both with Docker and Podman
         builder: ["docker", "podman"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       # Test all Makefile targets and make sure the ACAP files are created
       - name: Build
         run: CONTAINER_RUNTIME=${{ matrix.builder }} make -j

.github/workflows/super-linter.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0