[Snyk] Security upgrade ubuntu from latest to 22.04

[snyk-r7]

This PR was automatically created by Snyk using the credentials of a real user.

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:22.04, as this image has only 10 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
	221	CVE-2022-3219 SNYK-UBUNTU2204-GNUPG2-3035409	No Known Exploit
	300	Improper Verification of Cryptographic Signature SNYK-UBUNTU2204-PERL-2789081	No Known Exploit
	150	Time-of-check Time-of-use (TOCTOU) SNYK-UBUNTU2204-SHADOW-2801886	No Known Exploit
	150	Time-of-check Time-of-use (TOCTOU) SNYK-UBUNTU2204-SHADOW-2801886	No Known Exploit
	300	Out-of-bounds Write SNYK-UBUNTU2204-ZLIB-2975633	No Known Exploit

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