Bump versions in CI

Author: ptheywood

.github/workflows/build.yaml

@@ -8,13 +8,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       # Clone the repository and checkout into the relevant branch
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       # Install Ruby
       - name: Install Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7.3 # Check https://pages.github.com/versions/ for the current Ruby version used by gh pages.
+          ruby-version: 3.3.4 # Check https://pages.github.com/versions/ for the current Ruby version used by gh pages.
 
       # Install dependencies required to run jekyll build
       - name: Install gh-pages rubygem via bundler