[Snyk] Security upgrade postgres from 12.0 to 12.15

[huangshiyu13]

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

• src/postgresql/build/postgresql.k8s.dockerfile

We recommend upgrading to postgres:12.15, as this image has only 57 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
	714	Directory Traversal SNYK-DEBIAN10-DPKG-2847944	No Known Exploit
	786	CVE-2019-18862 SNYK-DEBIAN10-MAILUTILS-483076	Mature
	714	OS Command Injection SNYK-DEBIAN10-OPENSSL-2807585	No Known Exploit
	714	OS Command Injection SNYK-DEBIAN10-OPENSSL-2933515	No Known Exploit
	714	Double Free SNYK-DEBIAN10-SYSSTAT-537583	No Known Exploit

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