[Snyk] Security upgrade ubuntu from 20.04 to 20.10

[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

• tools/Dockerfile

We recommend upgrading to ubuntu:20.10, as this image has only 18 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
	321	Improper Check for Dropped Privileges SNYK-UBUNTU2004-BASH-581100	Mature
	371	CVE-2021-3580 SNYK-UBUNTU2004-NETTLE-1303240	No Known Exploit
	371	CVE-2021-3580 SNYK-UBUNTU2004-NETTLE-1303240	No Known Exploit
	300	Authentication Bypass SNYK-UBUNTU2004-SYSTEMD-1290722	No Known Exploit
	300	Authentication Bypass SNYK-UBUNTU2004-SYSTEMD-1290722	No Known Exploit

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