remove manual cache step

setup-go@v4 has auto caching, no point in manually doing it.

Author: dcarbone

.github/workflows/tests.yaml

@@ -27,16 +27,6 @@ jobs:
         with:
           go-version-file: go.mod
 
-      - name: Go mod cache
-        uses: actions/cache@v3
-        with:
-          path: |
-            ~/.cache/go-build
-            ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
-
       - name: Go vet
         run: go vet ./...