refactor: rename `DeLavenne` to `Lavenne`

Refs HYCAR-Hydro/airgr#111
2 jobs for 54-calibration-with-parameter-regularisation in 9 minutes and 19 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Checks
passed check_as_cran #191346
docker

00:09:18

passed check_not_cran #191345
docker

00:07:34