[Snyk] Security upgrade python from 3.8-slim to 3.9-slim

[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

• docker/Dockerfile.python-3.8

We recommend upgrading to python:3.9-slim, as this image has only 46 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	Issue	Exploit Maturity
	CVE-2022-34903 SNYK-DEBIAN11-GNUPG2-2939851	No Known Exploit
	OS Command Injection SNYK-DEBIAN11-OPENSSL-2933518	No Known Exploit
	OS Command Injection SNYK-DEBIAN11-OPENSSL-2933518	No Known Exploit
	CVE-2022-2097 SNYK-DEBIAN11-OPENSSL-2941242	No Known Exploit
	CVE-2022-2097 SNYK-DEBIAN11-OPENSSL-2941242	No Known Exploit

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[secure-code-warrior-for-github]

Micro-Learning Topic: OS command injection (Detected by phrase)

Matched on "OS Command Injection"

What is this? (2min video)

In many situations, applications will rely on OS provided functions, scripts, macros and utilities instead of reimplementing them in code. While functions would typically be accessed through a native interface library, the remaining three OS provided features will normally be invoked via the command line or launched as a process. If unsafe inputs are used to construct commands or arguments, it may allow arbitrary OS operations to be performed that can compromise the server.

Try this challenge in Secure Code Warrior