[Snyk] Security upgrade debian from 10.4-slim to 11-slim

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 Merge Request

• Dockerfile

We recommend upgrading to debian:11-slim, as this image has only 40 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
	514	Integer Overflow or Wraparound SNYK-DEBIAN10-APT-1049974	No Known Exploit
	714	Directory Traversal SNYK-DEBIAN10-DPKG-2847944	No Known Exploit
	614	Improper Input Validation SNYK-DEBIAN10-GZIP-2444259	No Known Exploit
	514	Use of a Broken or Risky Cryptographic Algorithm SNYK-DEBIAN10-LIBGCRYPT20-1582894	No Known Exploit
	500	Out-of-bounds Write SNYK-DEBIAN10-ZLIB-2976149	No Known Exploit

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