Update deploy.yml

Author: pbonte

.github/workflows/deploy.yml

@@ -21,7 +21,7 @@ jobs:
       with:
         ruby-version: '3.0.2'
     - name: Enable bundler cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: vendor/bundle
         key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}