[Snyk] Security upgrade python from 3.6-slim-buster to 3.10.3-slim-buster

[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:3.10.3-slim-buster, as this image has only 81 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
	500	Exposure of Resource to Wrong Sphere SNYK-DEBIAN10-EXPAT-2403518	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-DEBIAN10-EXPAT-2406128	No Known Exploit
	514	CVE-2021-4160 SNYK-DEBIAN10-OPENSSL-2388381	No Known Exploit
	733	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN10-OPENSSL-2426310	No Known Exploit
	733	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN10-OPENSSL-2426310	No Known Exploit

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[mcdonnnj]

The pshtt package does not support Python >3.7.