[Snyk] Security upgrade python from 3.5 to 3.6.13

[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

• {{cookiecutter.project_slug}}/docker/django/Dockerfile-dev

We recommend upgrading to python:3.6.13, as this image has only 343 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	Information Exposure SNYK-DEBIAN10-LIBGCRYPT20-1297893	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN10-OPENSSL-1075326	No Known Exploit
	714	Improper Encoding or Escaping of Output SNYK-DEBIAN10-PYTHON37-1013422	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-PYTHON37-1063182	No Known Exploit
	714	NULL Pointer Dereference SNYK-DEBIAN10-SUBVERSION-1071814	No Known Exploit

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