[Snyk] Security upgrade alpine from 3.15 to 3.16

[infamousjoeg]

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:3.16, as this image has only 1 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
	371	CVE-2023-3446 SNYK-ALPINE315-OPENSSL-5788364	No Known Exploit
	371	CVE-2023-3446 SNYK-ALPINE315-OPENSSL-5788364	No Known Exploit

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