[Snyk] Security upgrade alpine from 3.13.7 to 3.18.5

[xcaspar]

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 alpine:3.18.5, 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
	614	CVE-2022-28391 SNYK-ALPINE313-BUSYBOX-2440609	No Known Exploit
	614	CVE-2022-28391 SNYK-ALPINE313-BUSYBOX-2440609	No Known Exploit
	614	Use After Free SNYK-ALPINE313-BUSYBOX-2953337	No Known Exploit
	614	Out-of-bounds Write SNYK-ALPINE313-ZLIB-2434418	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE313-ZLIB-2976175	No Known Exploit

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