[Snyk] Security upgrade centos from 6.9 to latest

[svcgithubsnyk]

This PR was automatically created by Snyk using the credentials of a real user.

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

• protoc-artifacts/Dockerfile

We recommend upgrading to centos:latest, as this image has only 295 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	Out-of-bounds Write SNYK-CENTOS6-NSS-2141710	No Known Exploit
	714	Out-of-bounds Write SNYK-CENTOS6-NSSSYSINIT-2139744	No Known Exploit
	714	Out-of-bounds Write SNYK-CENTOS6-NSSTOOLS-2140537	No Known Exploit
	714	Out-of-bounds Write SNYK-CENTOS6-NSSUTIL-2141608	No Known Exploit
	614	Directory Traversal SNYK-CENTOS6-YUMPLUGINOVL-2151742	No Known Exploit

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