Use v4 of GitHub actions

Author: graygilmore

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     name: Deploy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup node.js
         uses: actions/setup-node@v4
@@ -28,7 +28,7 @@ jobs:
 
       - name: Cache node modules
         id: cache-npm
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         env:
           cache-name: cache-node-modules
         with: