[Snyk] Security upgrade postgres from 15.3-alpine to 15.5-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:15.5-alpine, 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
	686	CVE-2023-5363 SNYK-ALPINE318-OPENSSL-6032386	No Known Exploit
	686	CVE-2023-5363 SNYK-ALPINE318-OPENSSL-6032386	No Known Exploit
	436	CVE-2023-5678 SNYK-ALPINE318-OPENSSL-6055795	No Known Exploit
	436	CVE-2023-5678 SNYK-ALPINE318-OPENSSL-6055795	No Known Exploit

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[what-the-diff]

PR Summary

• Updated PostgreSQL Image in Dockerfile
  The version of the PostgreSQL image that we use in our Docker container has been updated. We've moved from version 15.3 to the newer 15.5, which should help improve the overall performance and stability of our application.

[codeclimate]

Code Climate has analyzed commit ca2540f and detected 0 issues on this pull request.

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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