[Snyk] Security upgrade python from slim-buster to 3-slim-bullseye

[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/generic/Dockerfile

We recommend upgrading to python:3-slim-bullseye, as this image has only 52 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
	400	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	400	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	400	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	400	Out-of-bounds Write SNYK-DEBIAN10-GLIBC-559488	No Known Exploit
	400	Out-of-bounds Write SNYK-DEBIAN10-GLIBC-559488	No Known Exploit

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