[Snyk] Security upgrade debian from buster to bullseye

[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

• Dockerfile

We recommend upgrading to debian:bullseye, 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
	400	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	400	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	400	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	150	Information Exposure SNYK-DEBIAN10-UTILLINUX-2401082	No Known Exploit
	471	Out-of-bounds Write SNYK-DEBIAN10-ZLIB-2433934	No Known Exploit

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.39%. Comparing base (e8deb8a) to head (9f4f95a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #130   +/-   ##
=======================================
  Coverage   71.39%   71.39%           
=======================================
  Files           5        5           
  Lines         451      451           
=======================================
  Hits          322      322           
  Misses        129      129           

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