Mats Kindahl b5ffc71071 Post-release steps for release 2.3.1
Add 2.3.1 to the update tests and update the downgrade target for the
downgrade version. This commit also fixes two issues that were fixed in
the release branch:

1. Drop `_timescaledb_internal.refresh_continuous_aggregate`
2. Update the changelog to match the release branch.
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