pgupgrade: reverting postgresql version to 13 for quay (PROJQUAY-7253)

[deshpandevlab]

This reverts the quay pg upgrade changes in commit 673eff3

Refer #959 (comment) for details.

Testing

• Tested push-pull
• Ran e2e test

PG versions queried on quay and clair pods

Quay PG pod:

Found PostgreSQL pod: shudeshp-registry-quay-database-64cb6b96bb-x6vfq
Pod is ready. Executing version query...
                                                    version
---------------------------------------------------------------------------------------------------------------
 PostgreSQL 13.11 on x86_64-redhat-linux-gnu, compiled by gcc (GCC) 11.3.1 20221121 (Red Hat 11.3.1-4), 64-bit

Clair PG pod:

Found PostgreSQL pod: shudeshp-registry-clair-postgres-6b7c7c48cd-rrbld
Pod is ready. Executing version query...
                                                  version
--------------------------------------------------------------------------------------------------------------
PostgreSQL 15.8 on x86_64-redhat-linux-gnu, compiled by gcc (GCC) 11.5.0 20240719 (Red Hat 11.5.0-2), 64-bit

• validated that the security scan is passed for the tags with this change

[deshpandevlab]

/ok-to-test

[deshpandevlab]

/retest-required

[openshift-ci]

@deshpandevlab: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/ocp-latest-e2e	cab05d3	link	true	/test ocp-latest-e2e

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[deshpandevlab]

The tests are failing for timeouts while getting waiting for quay to get ready. Checking if the test environment is changed. Did not notice any error while deploying locally:
https://shudeshp-registry-quay-quay-enterprise.apps.jonathan-ocp.gcp.quaydev.org/

thanks @bcaton85 for the help with pod logs. The test env needs to be updated to accommodate clair settings

[jonathankingfc]

LGTM