Two ScyllaDb updates

[MathieuDutSik]

Motivation

ScyllaDb remains the system we use for the Testnet though this may change. Here we update the configuration.

Proposal

Two things are done:

• The replication_factor is changed from 1 to 3 as per the recommendation of the manual.
• The version is bumped from 0.12.0 to 0.13.0

Test Plan

The CI.

Release Plan

Not relevant.

Links

• reviewer checklist

[MathieuDutSik]

Yes, that PR is closed. It does not do what I intended to.