[Snyk] Security upgrade python from 3.10.0rc1-slim to 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

• ruleserver/app/Dockerfile

We recommend upgrading to python:slim, 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
	571	Integer Overflow or Wraparound SNYK-DEBIAN11-EXPAT-2331811	No Known Exploit
	571	Buffer Overflow SNYK-DEBIAN11-GLIBC-2340908	No Known Exploit
	571	Buffer Overflow SNYK-DEBIAN11-GLIBC-2340908	No Known Exploit
	571	Buffer Overflow SNYK-DEBIAN11-GLIBC-2340922	No Known Exploit
	571	Buffer Overflow SNYK-DEBIAN11-GLIBC-2340922	No Known Exploit

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[sonarcloud[bot]]

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