change go version. try to fix golint

.github/workflows/tests.yml

@@ -46,10 +46,10 @@ jobs:
         ports:
           - 27017:27017
     steps:
-      - name: Set up Go 1.16
+      - name: Set up Go 1.18
         uses: actions/setup-go@v2
         with:
-          go-version: '1.16'
+          go-version: '1.18'
 
       - name: Check out code
         uses: actions/checkout@v2