[Snyk] Security upgrade golang from 1.12.6 to 1.17.8

[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

• Dockerfile

We recommend upgrading to golang:1.17.8, as this image has only 91 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-DEBIAN9-CURL-466505	No Known Exploit
	714	Double Free SNYK-DEBIAN9-CURL-466508	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

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