[Snyk] Security upgrade alpine from 3.15.4 to 3.16.9

[joebordes]

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

• docker/Dockerfile

We recommend upgrading to alpine:3.16.9, 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	Use After Free SNYK-ALPINE315-OPENSSL-3314621	No Known Exploit
	614	Use After Free SNYK-ALPINE315-OPENSSL-3314621	No Known Exploit
	614	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-ALPINE315-OPENSSL-3314622	No Known Exploit
	614	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-ALPINE315-OPENSSL-3314622	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE315-ZLIB-2976173	No Known Exploit

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🦉 Use After Free 🦉 Access of Resource Using Incompatible Type ('Type Confusion')