[Snyk] Security upgrade python from 3.10.6-slim-bullseye to 3.10.8-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

• Dockerfile

We recommend upgrading to python:3.10.8-slim-bullseye, 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	Priority Score / 1000	Issue	Exploit Maturity
	500	Use After Free SNYK-DEBIAN11-EXPAT-3023031	No Known Exploit
	400	Off-by-one Error SNYK-DEBIAN11-GLIBC-2340919	No Known Exploit
	500	Out-of-bounds Read SNYK-DEBIAN11-PCRE2-2808697	No Known Exploit
	500	Out-of-bounds Read SNYK-DEBIAN11-PCRE2-2808704	No Known Exploit
	500	Out-of-bounds Write SNYK-DEBIAN11-ZLIB-2976151	No Known Exploit

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[jonasbn]

LGTM, approved