[Snyk] Security upgrade python from 3.6.6-slim-stretch to 3.6.14-slim-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

• Dockerfile

We recommend upgrading to python:3.6.14-slim-stretch, as this image has only 86 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	Integer Overflow or Wraparound SNYK-DEBIAN9-OPENSSL-1075328	No Known Exploit
	614	Out-of-bounds Read SNYK-DEBIAN9-OPENSSL-1569399	No Known Exploit
	614	Use of a Broken or Risky Cryptographic Algorithm SNYK-DEBIAN9-OPENSSL-339889	No Known Exploit
	614	Key Management Errors SNYK-DEBIAN9-OPENSSL-374003	No Known Exploit
	686	Information Exposure SNYK-DEBIAN9-OPENSSL-374448	Mature

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