Try bumping workflow versions

.github/workflows/build.yml

@@ -10,16 +10,16 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v4
+      - uses: actions/cache@v4
         with:
           path: vendor/bundle
           key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile') }}
           restore-keys: |
             ${{ runner.os }}-gems-
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.6
+          ruby-version: 3.3
           bundler-cache: true
       - name: jekyll build
         run: bundle exec jekyll build