feat: upgrade to checkout@v4 and cache@v4

Author: jeffreytse

.github/workflows/deploy-test.yml

@@ -9,8 +9,8 @@ jobs:
   github-pages:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/cache@v3
+    - uses: actions/checkout@v4
+    - uses: actions/cache@v4
       with:
         path: |
           .asdf/**