[Snyk] Security upgrade python from 3.7-alpine to 3.9.8-alpine

[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

• ctfcli/templates/programming/default/{{cookiecutter.name}}/Dockerfile

We recommend upgrading to python:3.9.8-alpine, as this image has only 8 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
	471	Resource Exhaustion SNYK-ALPINE315-EXPAT-2342110	No Known Exploit
	****	CVE-2021-22827 SNYK-ALPINE315-EXPAT-2342111	No Known Exploit
	471	Integer Overflow or Wraparound SNYK-ALPINE315-EXPAT-2342112	No Known Exploit
	****	CVE-2021-22825 SNYK-ALPINE315-EXPAT-2342114	No Known Exploit
	****	CVE-2021-22824 SNYK-ALPINE315-EXPAT-2342115	No Known Exploit

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