Upgrade upload-artifact action to v4, as v3 will soon stop working

Also upgraded upload-pages-artifact, as it has a transitive dependency on upload-artifact, and deploy-pages to work with the upgraded upload-pages-artifact

.github/workflows/ci.yaml

@@ -111,7 +111,7 @@ jobs:
 
       - name: Upload artifact
         if: env.GITHUB_PAGES == 'true'
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
         with:
           # Upload entire repository
           path: 'target/site'
@@ -139,7 +139,7 @@ jobs:
 
       - name: Deploy site to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v1
+        uses: actions/deploy-pages@v4
         if: env.GITHUB_PAGES == 'true'
 
   downstream:

.github/workflows/pull-request.yaml

@@ -72,7 +72,7 @@ jobs:
 
       - name: Upload Test Results
         if: success() || failure()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Test Results
           path: |
@@ -86,7 +86,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Upload
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Event File
           path: ${{ github.event_path }}