[Snyk] Security upgrade debian from bullseye-slim to 11.6-slim

[DvirDukhan]

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

• rmbuilder/Dockerfile

We recommend upgrading to debian:11.6-slim, as this image has only 43 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
	221	CVE-2022-3219 SNYK-DEBIAN11-GNUPG2-3330745	No Known Exploit
	471	Information Exposure SNYK-DEBIAN11-GNUTLS28-3318299	No Known Exploit
	150	NULL Pointer Dereference SNYK-DEBIAN11-SHADOW-3310898	No Known Exploit
	150	Access Restriction Bypass SNYK-DEBIAN11-SHADOW-526940	No Known Exploit
	150	Time-of-check Time-of-use (TOCTOU) SNYK-DEBIAN11-SHADOW-528840	No Known Exploit

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