[Snyk] Security upgrade alpine from 3.14.1 to 3.18.6

[omnipresent07]

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:3.18.6, 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
	714	Buffer Overflow SNYK-ALPINE314-OPENSSL-1569445	No Known Exploit
	714	Buffer Overflow SNYK-ALPINE314-OPENSSL-1569445	No Known Exploit
	614	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-ALPINE314-OPENSSL-3314646	No Known Exploit
	614	Double Free SNYK-ALPINE314-OPENSSL-3314653	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE314-ZLIB-2976174	No Known Exploit

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🦉 Access of Resource Using Incompatible Type ('Type Confusion')