[Snyk] Security upgrade postgres from 9.3 to 9.6

[snyk-bot]

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

• devenv/docker/blocks/postgres_tests/Dockerfile

We recommend upgrading to postgres:9.6, as this image has only 103 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
	886	Improper Input Validation SNYK-DEBIAN9-EXIM4-349155	Mature
	714	Buffer Overflow SNYK-DEBIAN9-PYTHON35-1063181	No Known Exploit
	714	Credentials Management SNYK-DEBIAN9-PYTHON35-340072	No Known Exploit
	714	Directory Traversal SNYK-DEBIAN9-PYTHON35-453739	No Known Exploit
	714	Credentials Management SNYK-DEBIAN9-PYTHON35-584435	No Known Exploit

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[mistaken-pull-closer[bot]]

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[pull-dog[bot]]

*Ruff* :dog: I wasn't able to find any Docker Compose files in your repository at any of the given paths in the pull-dog.json configuration file, or the default docker-compose.yml file :weary: Make sure the given paths are correct.

Files checked:

• docker-compose.yml

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