[Snyk] Security upgrade alpine from 3.17 to 3.18.5

[johnrk]

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 2 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
	586	Out-of-bounds Write SNYK-ALPINE317-OPENSSL-6148880	No Known Exploit
	586	Out-of-bounds Write SNYK-ALPINE317-OPENSSL-6148880	No Known Exploit
	436	CVE-2023-6237 SNYK-ALPINE317-OPENSSL-6160001	No Known Exploit
	436	CVE-2023-6237 SNYK-ALPINE317-OPENSSL-6160001	No Known Exploit

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