chore(scan.yaml): bump deprecated download-artifact and deploy-pages

GitHub annotated every scan run with 'Node.js 20 is deprecated' because
actions/download-artifact@v5.0.0 and actions/deploy-pages@v4.0.5 still
target Node 20. Bump to v8.0.1 and v5.0.0 (both Node 24).

Author: DevelopmentCats

.github/workflows/scan.yaml

@@ -166,7 +166,7 @@ jobs:
           python -m pip install --upgrade pip
           pip install -e .
       - name: Download all skill artifacts
-        uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v5.0.0
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           path: scans
           pattern: skill-*
@@ -194,12 +194,12 @@ jobs:
       - name: Checkout
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       - name: Download scan-index
-        uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v5.0.0
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: scan-index
           path: .
       - name: Download all skill artifacts
-        uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v5.0.0
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           path: skills
           pattern: skill-*
@@ -282,7 +282,7 @@ jobs:
           python -m pip install --upgrade pip
           pip install -e .
       - name: Download scan-index
-        uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v5.0.0
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: scan-index
           path: .
@@ -328,7 +328,7 @@ jobs:
           path: pages
       - name: Deploy Pages
         id: deploy
-        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4.0.5
+        uses: actions/deploy-pages@cd2ce8fcbc39b97be8ca5fce6e763baed58fa128 # v5.0.0
 
   open-issue-on-failure:
     name: Open or update tracker issue