[Snyk] Security upgrade mongo from 4.2.8 to 4.4.21

[ksatchit]

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

• custom/mongo/Dockerfile

We recommend upgrading to mongo:4.4.21, as this image has only 15 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
	614	NULL Pointer Dereference SNYK-UBUNTU1804-OPENSSL-1049135	No Known Exploit
	614	NULL Pointer Dereference SNYK-UBUNTU1804-OPENSSL-1089073	No Known Exploit
	614	Buffer Overflow SNYK-UBUNTU1804-OPENSSL-1569474	No Known Exploit
	614	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-UBUNTU1804-OPENSSL-2426347	No Known Exploit
	614	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-UBUNTU1804-OPENSSL-3314796	No Known Exploit

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