[Snyk] Security upgrade python from 3-slim to 3.12.0b1-slim

[mardiros]

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

• examples/prometheus_metrics/user/Dockerfile

We recommend upgrading to python:3.12.0b1-slim, as this image has only 69 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
	150	Information Exposure SNYK-DEBIAN12-UTILLINUX-2401083	No Known Exploit
	150	Information Exposure SNYK-DEBIAN12-UTILLINUX-2401083	No Known Exploit
	150	Information Exposure SNYK-DEBIAN12-UTILLINUX-2401083	No Known Exploit
	150	Information Exposure SNYK-DEBIAN12-UTILLINUX-2401083	No Known Exploit
	571	Integer Overflow or Wraparound SNYK-DEBIAN12-ZLIB-6008963	No Known Exploit

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[codecov]

Codecov Report

Merging #79 (88fb759) into main (5b3cef0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #79   +/-   ##
=======================================
  Coverage   99.75%   99.75%           
=======================================
  Files          47       47           
  Lines        1605     1605           
=======================================
  Hits         1601     1601           
  Misses          4        4