ci: update Go and golangci-lint

.github/workflows/test.yml

@@ -2,25 +2,25 @@
 name: test
 on:
   push:
-    branches: [master]
+    branches: [main]
     tags: [v*]
   pull_request:
-    branches: [master]
+    branches: [main]
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-go@v2
       with:
-        go-version: '1.15.0'
+        go-version: '1.16.7'
     - run: go version
     - run: go mod download
 
     - name: golangci-lint
       uses: golangci/golangci-lint-action@v2
       with:
-        version: v1.33
+        version: v1.42
 
     - name: remove changes
       # Sometimes it is failed to release by goreleaser due to changes of go.sum