[Snyk] Security upgrade python from 3.6-slim to 3.8.18-slim

[mikolajroszak]

This PR was automatically created by Snyk using the credentials of a real user.

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

• docker/Dockerfile.python-3.6

We recommend upgrading to python:3.8.18-slim, as this image has only 44 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
	714	Buffer Overflow SNYK-DEBIAN11-GLIBC-2340922	No Known Exploit
	829	Out-of-bounds Write SNYK-DEBIAN11-GLIBC-5927133	Mature
	829	Out-of-bounds Write SNYK-DEBIAN11-GLIBC-5927133	Mature
	714	Out-of-bounds Read SNYK-DEBIAN11-PCRE2-2808697	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN11-ZLIB-2976151	No Known Exploit

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Micro-Learning Topic: Buffer overflow (Detected by phrase)

Matched on "Buffer Overflow"

What is this? (2min video)

A buffer overflow condition exists when a program attempts to put more data in a buffer than it can hold or when a program attempts to put data in a memory area past a buffer.

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