fix(CI): use go 1.18

Author: kkweon

.github/workflows/go.yaml

@@ -14,10 +14,9 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Go 1.16
-        uses: actions/setup-go@v2
+      - uses: actions/setup-go@v2
         with:
-          go-version: 1.16
+          go-version: 1.18
       - run: go build -v ./...
       - run: go test -race -coverprofile=coverage.txt -covermode=atomic -v ./...
       - run: bash <(curl -s https://codecov.io/bash)