[Snyk] Security upgrade ubuntu from xenial to xenial-20210416

[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

• docker/Dockerfile.server.ubuntu

We recommend upgrading to ubuntu:xenial-20210416, 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
	514	Use of a Broken or Risky Cryptographic Algorithm SNYK-UBUNTU1604-LIBGCRYPT20-1585790	No Known Exploit
	614	Allocation of Resources Without Limits or Throttling SNYK-UBUNTU1604-SYSTEMD-1320131	No Known Exploit
	614	Allocation of Resources Without Limits or Throttling SNYK-UBUNTU1604-SYSTEMD-1320131	No Known Exploit
	614	Allocation of Resources Without Limits or Throttling SNYK-UBUNTU1604-SYSTEMD-1320131	No Known Exploit
	614	Allocation of Resources Without Limits or Throttling SNYK-UBUNTU1604-SYSTEMD-1320131	No Known Exploit

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