Update awalsh128/cache-apt-pkgs-action action to v1.6.0

Author: renovate[bot]

.github/workflows/update-stencil2.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v5
-    - uses: awalsh128/cache-apt-pkgs-action@v1
+    - uses: awalsh128/cache-apt-pkgs-action@acb598e5ddbc6f68a970c5da0688d2f3a9f04d05 # v1.6.0
       with:
         packages: pacman-package-manager libarchive-tools
         version: 1.0