Merge pull request #173 from digitalocean/asb/actions/cache@v4

ci: upgrade to actions/cache@v4

Author: andrewsomething

.github/workflows/test.yml

@@ -24,7 +24,7 @@ jobs:
           go-version: ${{ matrix.go-version }}
 
       - name: Restore cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/go/pkg/mod
           key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}