[Snyk] Security upgrade alpine from 3.18.3 to 3.18.6

[saisona]

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
	614	CVE-2023-5363 SNYK-ALPINE318-OPENSSL-6032386	No Known Exploit
	614	CVE-2023-5363 SNYK-ALPINE318-OPENSSL-6032386	No Known Exploit
	514	Improper Check for Unusual or Exceptional Conditions SNYK-ALPINE318-OPENSSL-6055795	No Known Exploit
	586	Out-of-bounds Write SNYK-ALPINE318-OPENSSL-6152404	No Known Exploit
	586	Out-of-bounds Write SNYK-ALPINE318-OPENSSL-6152404	No Known Exploit

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