fix: pin Pages workflow actions

.github/workflows/pages.yml

@@ -19,18 +19,22 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        # Immutable pin for actions/checkout v6.
+        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803
 
       - name: Configure GitHub Pages
-        uses: actions/configure-pages@v5
+        # Immutable pin for actions/configure-pages v5.
+        uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b
 
       - name: Set up pnpm
-        uses: pnpm/action-setup@v4
+        # Immutable pin for pnpm/action-setup v4.
+        uses: pnpm/action-setup@b906affcce14559ad1aafd4ab0e942779e9f58b1
         with:
           version: 9.12.0
 
       - name: Set up Node.js
-        uses: actions/setup-node@v4
+        # Immutable pin for actions/setup-node v4.
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020
         with:
           node-version: 20
           cache: pnpm
@@ -44,7 +48,8 @@ jobs:
           MEMORYGUARD_GITHUB_PAGES: "true"
 
       - name: Upload Pages artifact
-        uses: actions/upload-pages-artifact@v4
+        # Immutable pin for actions/upload-pages-artifact v4.
+        uses: actions/upload-pages-artifact@7b1f4a764d45c48632c6b24a0339c27f5614fb0b
         with:
           path: apps/landing/out
 
@@ -57,4 +62,5 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        # Immutable pin for actions/deploy-pages v4.
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e