[Snyk] Security upgrade ubuntu from 20.04 to rolling

[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 ubuntu:rolling, as this image has only 19 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
	586	CVE-2021-3996 SNYK-UBUNTU2004-UTILLINUX-2387723	No Known Exploit
	586	CVE-2021-3996 SNYK-UBUNTU2004-UTILLINUX-2387723	No Known Exploit
	586	CVE-2021-3995 SNYK-UBUNTU2004-UTILLINUX-2387728	No Known Exploit
	586	CVE-2021-3995 SNYK-UBUNTU2004-UTILLINUX-2387728	No Known Exploit
	586	CVE-2021-3995 SNYK-UBUNTU2004-UTILLINUX-2387728	No Known Exploit

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