fix: correct action versions (upload-pages-artifact@v4, upload-artifact@v7, download-artifact@v8)

upload-pages-artifact@v5 does not exist — reverted to @v4 (latest available).
upload-artifact bumped to @v7 (latest), download-artifact to @v8 (latest).

Author: thodel

.github/workflows/quarto-publish.yml

@@ -112,14 +112,14 @@ jobs:
           npx --yes @divriots/jampack ./_site
 
       - name: Upload Built Artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v7
         with:
           name: built-site
           path: _site
 
       - name: Upload static files as artifact
         id: deployment
-        uses: actions/upload-pages-artifact@v5 # or specific "vX.X.X" version tag for this action
+        uses: actions/upload-pages-artifact@v4 # or specific "vX.X.X" version tag for this action
         with:
           path: _site
 
@@ -130,7 +130,7 @@ jobs:
 
     steps:
       - name: Download Built Artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v8
         with:
           name: built-site
           path: _site