chore: support newer Postgres versions: 13, 14, 15(beta) (#508)
Description
- update the list of Postgres versions
- run tests against newer Postgres versions: 13, 14, 15(beta) in CI
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the MR description has been reviewed -
this MR contains text changes and they have been reviewed OR there are no texts changes -
this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes -
this MR contains API changes and they have been reviewed OR there are no API changes
Closes #508 (closed)