[Snyk] Security upgrade golang from 1.8.4-stretch to 1.16-stretch

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• vendor/github.com/coreos/etcd/e2e/docker/Dockerfile

We recommend upgrading to golang:1.16-stretch, as this image has only 306 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	714	Buffer Overflow SNYK-DEBIAN9-PYTHON27-1063180	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN9-PYTHON27-306461	No Known Exploit
	714	Arbitrary Command Injection SNYK-DEBIAN9-PYTHON27-306503	No Known Exploit
	714	CVE-2019-9636 SNYK-DEBIAN9-PYTHON27-340070	No Known Exploit
	714	Directory Traversal SNYK-DEBIAN9-PYTHON27-341379	No Known Exploit

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