* Update to go mod tidy with 1.17+

While running go mod tidy the following issue encountered:
```
go: downloading github.com/stretchr/objx v0.4.0
github.com/coredns/coredns/plugin/trace imports
	gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer imports
	github.com/DataDog/datadog-go/v5/statsd tested by
	github.com/DataDog/datadog-go/v5/statsd.test imports
	github.com/stretchr/testify/mock imports
	github.com/stretchr/objx loaded from github.com/stretchr/objx@v0.2.0,
	but go 1.16 would select v0.4.0

To upgrade to the versions selected by go 1.16:
	go mod tidy -go=1.16 && go mod tidy -go=1.17
If reproducibility with go 1.16 is not needed:
	go mod tidy -compat=1.17
For other options, see:
	https://golang.org/doc/modules/pruning
```

This PR cleans up to get rid of the issues above.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update to use `go mod tidy -compat=1.17`, also changed to invoked daily
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>