[Snyk] Security upgrade alpine from 3.9 to 3.19

[crashdump]

Snyk has created this PR to fix 3 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• docker/Dockerfile.flux

We recommend upgrading to alpine:3.19, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Improper Certificate Validation SNYK-ALPINE39-OPENSSL-1089232	184
	Improper Certificate Validation SNYK-ALPINE39-OPENSSL-1089232	184
	Integer Overflow or Wraparound SNYK-ALPINE39-OPENSSL-1089235	148
	Integer Overflow or Wraparound SNYK-ALPINE39-OPENSSL-1089235	148
	NULL Pointer Dereference SNYK-ALPINE39-OPENSSL-1089233	128

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Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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