[Snyk] Security upgrade debian from buster-slim to 10.12-slim

[jdrouet]

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/mrml-actix/Dockerfile

We recommend upgrading to debian:10.12-slim, as this image has only 70 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	Issue	Exploit Maturity
	CVE-2022-1664 SNYK-DEBIAN10-DPKG-2847944	No Known Exploit
	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	Information Exposure SNYK-DEBIAN10-UTILLINUX-2401082	No Known Exploit

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