[Snyk] Security upgrade postgres from 15.3-alpine to 15.6-alpine

[yurake]

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

• kubernetes/postgres/Dockerfile

We recommend upgrading to postgres:15.6-alpine, 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
	614	CVE-2023-5363 SNYK-ALPINE318-OPENSSL-6032386	No Known Exploit
	614	CVE-2023-5363 SNYK-ALPINE318-OPENSSL-6032386	No Known Exploit
	514	Improper Check for Unusual or Exceptional Conditions SNYK-ALPINE318-OPENSSL-6055795	No Known Exploit
	586	CVE-2024-0727 SNYK-ALPINE318-OPENSSL-6191692	No Known Exploit
	586	CVE-2024-0727 SNYK-ALPINE318-OPENSSL-6191692	No Known Exploit

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[what-the-diff]

PR Summary

• Updated Base Image in Dockerfile
  The foundation for our project's environment setup, known as the Dockerfile, has been updated. The original base image used was an older version of Postgres (15.3), but it has now been switched to a newer version (15.6). This helps ensure we are running our service on a more up-to-date and potentially more secure platform.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codeclimate]

Code Climate has analyzed commit 77c1bb9 and detected 0 issues on this pull request.

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