[Snyk] Security upgrade alpine from 3.15.0 to 3.18.3

[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-utils/Dockerfile

We recommend upgrading to alpine:3.18.3, as this image has only 0 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
	400	CVE-2022-28391 SNYK-ALPINE315-BUSYBOX-2440607	No Known Exploit
	400	Double Free SNYK-ALPINE315-OPENSSL-3314629	No Known Exploit
	400	Improper Certificate Validation SNYK-ALPINE315-OPENSSL-3368753	No Known Exploit
	400	Allocation of Resources Without Limits or Throttling SNYK-ALPINE315-OPENSSL-5661569	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE315-ZLIB-2976173	No Known Exploit

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