ci: update to actions/checkout@v4

Author: jpgrayson

.github/workflows/publish.yml

@@ -7,7 +7,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -22,12 +22,10 @@ jobs:
           ruby-version: '3.3'
 
       - name: Install asciidoctor
-        run: |
-          gem install asciidoctor
+        run: gem install asciidoctor
 
       - name: Build Site
-        run: |
-          hugo
+        run: hugo
 
       - name: Deploy to master
         uses: peaceiris/actions-gh-pages@v3