Update ci.yml

upgrade actions/setup-go@v4 to support cache by default

.github/workflows/ci.yml

@@ -18,23 +18,10 @@ jobs:
       uses: actions/checkout@v3
   
     - name: Set up Go
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v4
       with:
         go-version: ${{ matrix.goVer }}
-
-    - name: Setup Environment
-      run: |
-         echo "GOPATH=$(go env GOPATH)" >> $GITHUB_ENV
-         echo "$(go env GOPATH)/bin" >> $GITHUB_PATH
-
-    - name: Module cache
-      uses: actions/cache@v3
-      env:
-        cache-name: go-mod-cache
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('**/go.sum') }}
-          
+       
     - name: Test with Coverage
       run: go test -coverpkg=./... -v -short -coverprofile=coverage1.txt -covermode=atomic ./...
       env:
@@ -48,4 +35,4 @@ jobs:
     - name: Upload coverage to Codecov
       uses: codecov/codecov-action@v3
       with:
-        files: ./coverage1.txt,./coverage2.txt
+        files: ./coverage1.txt,./coverage2.txt