Merge pull request #300 from nukosuke/dependabot/github_actions/actio…

…ns/cache-4

Bump actions/cache from 3 to 4

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Check out code into the Go module directory
       uses: actions/checkout@v4
 
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       with:
         path: |
           ~/go/pkg/mod