[Snyk] Security upgrade golang from 1.13-stretch to 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/bflad/tfproviderdocs/Dockerfile

We recommend upgrading to golang:stretch, as this image has only 302 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
	733	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN9-OPENSSL-2426305	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN9-PYTHON27-1063180	No Known Exploit
	714	CVE-2019-9636 SNYK-DEBIAN9-PYTHON27-340070	No Known Exploit
	714	Directory Traversal SNYK-DEBIAN9-PYTHON27-341379	No Known Exploit
	614	NULL Pointer Dereference SNYK-DEBIAN9-SUBVERSION-1071813	No Known Exploit

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