Github Actions cache@v4

Author: joliver

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
     - uses: actions/setup-go@v4
       with:
         go-version: 'stable'
-    - uses: actions/cache@v2
+    - uses: actions/cache@v4
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}