[Snyk] Security upgrade python from 3.9.8-alpine to 3.10-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

We recommend upgrading to python:3.10-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
	500	Integer Overflow or Wraparound SNYK-ALPINE314-EXPAT-2407748	No Known Exploit
	500	Improper Encoding or Escaping of Output SNYK-ALPINE314-EXPAT-2407750	No Known Exploit
	500	Exposure of Resource to Wrong Sphere SNYK-ALPINE314-EXPAT-2407755	No Known Exploit
	567	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE314-OPENSSL-2426333	No Known Exploit
	567	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE314-OPENSSL-2426333	No Known Exploit

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[dav3r]

Superceded by #83.