[Snyk] Security upgrade python from 3.7 to 3.9.5

[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:3.9.5, as this image has only 449 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	Integer Overflow or Wraparound SNYK-DEBIAN11-EXPAT-2359255	No Known Exploit
	571	Integer Overflow or Wraparound SNYK-DEBIAN11-EXPAT-2359255	No Known Exploit
	571	Integer Overflow or Wraparound SNYK-DEBIAN11-EXPAT-2384928	No Known Exploit
	571	Integer Overflow or Wraparound SNYK-DEBIAN11-EXPAT-2384928	No Known Exploit
	500	Buffer Overflow SNYK-DEBIAN11-GLIBC-2340922	No Known Exploit

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[mcdonnnj]

Due to dependency constraints Python 3.7 is the latest release of Python we can support in this package.