chore: pin actions to SHA in .github/workflows/test.yml

Author: slawomirbabicz

.github/workflows/test.yml

@@ -14,10 +14,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Setup PNPM
-        uses: dfinity/ci-tools/actions/setup-pnpm@main
+        uses: dfinity/ci-tools/actions/setup-pnpm@afeee4fbdc0683a88ec5a74ed7f59a2ce0e833ad # main
 
       - name: Run sccache-cache
         uses: mozilla-actions/sccache-action@7d986dd989559c6ecdb630a3fd2557667be217ad # v0.0.9