Anchore: Update postgres subchart to 12.x

Package Merge Request

Package Changes

https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/anchore-enterprise/-/blob/1.18.6-bb.7/CHANGELOG.md

Package MR

https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/anchore-enterprise/-/merge_requests/106

For Issue

Closes https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/anchore-enterprise/-/issues/73

Closes https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/anchore-enterprise/-/issues/61

BB Processes

Add labels for affected packages so that they are deployed in CI as well as a status label:

Be sure to assign to yourself:

Once it is ready for review switch the status and assign reviewers: