[Snyk] Security upgrade python from 3.8.3-alpine to 3.8-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

• Dockerfile.python.drf_ms_pg

We recommend upgrading to python:3.8-alpine, as this image has only 0 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
	571	Out-of-bounds Read SNYK-ALPINE312-APKTOOLS-1246338	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-ALPINE312-OPENSSL-1075735	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-ALPINE312-OPENSSL-1075735	No Known Exploit
	500	Improper Certificate Validation SNYK-ALPINE312-OPENSSL-1089238	No Known Exploit
	500	Improper Certificate Validation SNYK-ALPINE312-OPENSSL-1089238	No Known Exploit

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[coveralls]

Pull Request Test Coverage Report for Build 179

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 134:	0.0%
Covered Lines:	81
Relevant Lines:	81

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💛 - Coveralls