[Snyk] Security upgrade node from 8.15.1 to 8.17

[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.static

We recommend upgrading to node:8.17, as this image has only 814 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	Improper Input Validation SNYK-DEBIAN9-SUBVERSION-456173	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN9-UNZIP-358298	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN9-WGET-342192	No Known Exploit
	821	Arbitrary File Overwrite SNYK-UPSTREAM-NODE-538285	Proof of Concept
	821	Arbitrary File Write SNYK-UPSTREAM-NODE-538286	Proof of Concept

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