[Snyk] Security upgrade alpine from latest to 3.18.3

[Somefive]

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:3.18.3, 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
	300	Improper Authentication SNYK-ALPINE318-OPENSSL-5776808	No Known Exploit
	300	Improper Authentication SNYK-ALPINE318-OPENSSL-5776808	No Known Exploit
	371	Inefficient Regular Expression Complexity SNYK-ALPINE318-OPENSSL-5788370	No Known Exploit
	371	Inefficient Regular Expression Complexity SNYK-ALPINE318-OPENSSL-5788370	No Known Exploit
	221	CVE-2023-3817 SNYK-ALPINE318-OPENSSL-5821142	No Known Exploit

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[chivalryq]

@Somefive Can you sign the DCO?