Use setup-go v3 with built-in cache

.github/workflows/test.yml

@@ -25,16 +25,10 @@ jobs:
       run: sudo apt-get install libgpgme-dev
 
     - name: Setup go ${{ matrix.go }}
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
         go-version: ${{ matrix.go }}
-
-    - uses: actions/cache@v2
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: |
-          ${{ runner.os }}-go-
+        cache: true
 
     - name: Build with go ${{ matrix.go }}
       run: make all