[Snyk] Security upgrade python from 2.7-slim to 3.6-slim

[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

• docker/Dockerfile.python-2

We recommend upgrading to python:3.6-slim, as this image has only 37 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
	614	Information Exposure SNYK-DEBIAN10-LIBGCRYPT20-1297893	No Known Exploit
	614	Integer Overflow or Wraparound SNYK-DEBIAN10-OPENSSL-1075326	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-OPENSSL-1569403	No Known Exploit
	614	Out-of-bounds Read SNYK-DEBIAN10-OPENSSL-1569406	No Known Exploit
	614	NULL Pointer Dereference SNYK-DEBIAN10-OPENSSL-567125	No Known Exploit

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