Update github actions to latest versions (5)

Author: dgmstuart

.github/workflows/github-pages.yml

@@ -11,10 +11,10 @@ jobs:
 
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v5
 
       - name: Get cached gems
-        uses: actions/cache@v2
+        uses: actions/cache@v5
         with:
           path: vendor/bundle
           key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}