[Snyk] Security upgrade python from 3.6.8 to 3.8

[omnipresent07]

This PR was automatically created by Snyk using the credentials of a real user.

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:3.8, as this image has only 160 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	Buffer Overflow SNYK-DEBIAN9-CURL-466505	No Known Exploit
	714	Double Free SNYK-DEBIAN9-CURL-466508	No Known Exploit
	714	Directory Traversal SNYK-DEBIAN9-DPKG-2847943	No Known Exploit
	714	CVE-2019-1353 SNYK-DEBIAN9-GIT-537142	No Known Exploit
	714	NULL Pointer Dereference SNYK-DEBIAN9-IMAGEMAGICK-400292	No Known Exploit

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