mycli: patch tests

Similar to f3c66bb3. Due to invalid
datatypes a lot of the tests broke.

The patch is based on an upstream PR[1], but had to be modified in order
to apply on v1.19.0.

See also https://hydra.nixos.org/build/90119741
Addresses #56826

[1] https://github.com/dbcli/mycli/pull/711