[Snyk] Security upgrade alpine from latest to 3.18.3

[CharlieC3]

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

• testnet/puppet-chain/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	Issue	Exploit Maturity
	Improper Authentication SNYK-ALPINE318-OPENSSL-5776808	No Known Exploit
	Improper Authentication SNYK-ALPINE318-OPENSSL-5776808	No Known Exploit
	Inefficient Regular Expression Complexity SNYK-ALPINE318-OPENSSL-5788370	No Known Exploit
	Inefficient Regular Expression Complexity SNYK-ALPINE318-OPENSSL-5788370	No Known Exploit
	CVE-2023-3817 SNYK-ALPINE318-OPENSSL-5821142	No Known Exploit

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[codecov[bot]]

Codecov Report

Merging #329 (9cef355) into master (e08cda5) will not change coverage. Report is 2 commits behind head on master. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #329   +/-   ##
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  Coverage   60.00%   60.00%           
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  Files           4        4           
  Lines          45       45           
  Branches        6        6           
=======================================
  Hits           27       27           
  Misses         18       18