ci: set go version in golangci-lint workflow

setup-go defaults to go 1.15, which is too old.

Author: wfscheper

.github/workflows/golangci-lint.yaml

@@ -12,6 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/setup-go@f6164bd8c8acb4a71fb2791a8b6c4024ff038dab
+        with:
+          go-version: 1.16
       - uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
       - name: Lint with golangci-lint
         uses: golangci/golangci-lint-action@b517f99ae23d86ecc4c0dec08dcf48d2336abc29