Update github action versions.

.github/workflows/build.yaml

@@ -6,10 +6,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v3
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Setup Node
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
 
       - name: Install dependencies
         run: npm install
@@ -22,7 +22,7 @@ jobs:
 
       - name: Setup Git
         if: github.event_name == 'push' && github.ref_name == 'main'
-        uses: fregante/setup-git-user@v1
+        uses: fregante/setup-git-user@024bc0b8e177d7e77203b48dab6fb45666854b35 # v2
 
       - name: Commit/push if there is a diff
         if: github.event_name == 'push' && github.ref_name == 'main'

.github/workflows/ci.yaml

@@ -8,7 +8,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: (BEFORE) Setup test cases
         run: echo '**Content of file referenced with absolute path**' > /tmp/foobar.txt