chore(deps): update actions/cache action to v4

.github/workflows/build.yml

@@ -25,7 +25,7 @@ jobs:
       with:
         repository: ${{ github.event.pull_request.head.repo.full_name }}
         ref: ${{ github.head_ref }}
-    - uses: actions/cache@v2.1.8
+    - uses: actions/cache@v4.0.2
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ matrix.go-version }}-${{ hashFiles('**/go.sum') }}

.github/workflows/gofmt.yml

@@ -31,7 +31,7 @@ jobs:
           go-version: ${{ matrix.go-version }}
       - name: "get golang version"
         run: echo "::set-env name=golang-version::$(go version)"
-      - uses: actions/cache@v2.1.8
+      - uses: actions/cache@v4.0.2
         with:
           path: ~/go
           key: ${{ runner.os }}-go-${{ env.golang-version }}