Upgrade embedded-postgres plugin and binaries.

[bcipriano]

Link the Issue(s) this Pull Request is related to. Fixes #1196.

Summarize your change. The existing embedded-postgres we're using is old and does not support arm64v8 architecture.

Previously, newer binaries would produce unusual results on arm64v8+Docker -- see https://github.com/zonkyio/embedded-postgres/issues/99 for more details.

That issue is now fixed, and new binaries have been published.

This change still requires us to update one query with a CAST to numeric. However this query fails in the same way both within and without of Docker, so I believe it is related to the new Postgres version rather than the previously mentioned embedded-postgres issue.