Update GitHub Actions to current versions

   actions/checkout v3→v4, configure-pages v3→v5, cache v3→v4,
   upload-pages-artifact v1→v3, deploy-pages v2→v4. Fixes build
   failure due to deprecated upload-artifact v3.

Author: risacher

.github/workflows/jekyll.yml

@@ -31,16 +31,16 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup Ruby
-        uses: ruby/setup-ruby@55283cc23133118229fd3f97f9336ee23a179fcf # v1.146.0
+        uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
           cache-version: 0 # Increment this number if you need to re-download cached gems
           ruby-version: 3.0.5
       - name: Setup Pages
         id: pages
-        uses: actions/configure-pages@v3
+        uses: actions/configure-pages@v5
       - name: Build with Jekyll
         # Outputs to the './_site' directory by default
         run: bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
@@ -53,7 +53,7 @@ jobs:
         run: mkdir -p $GITHUB_WORKSPACE/tmp/.htmlproofer
 
       - name: Cache html-proofer
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: $GITHUB_WORKSPACE/tmp/.htmlproofer
           key: ${{ runner.os }}-htmlproofer-${{ hashFiles('**/*') }}
@@ -69,7 +69,7 @@ jobs:
         run: ./scripts/test
       - name: Upload artifact
         # Automatically uploads an artifact from the './_site' directory by default
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
         with:
           path: "public/"
 
@@ -83,4 +83,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v4