chore: prepare for `0.0.19`

[jdockerty]

The new preparation script works very nicely here too, great convenience :rocket:

scripts/prepare_release.sh 0.0.19
Latest tag: v0.0.18
Latest version: 0.0.18
Desired version: 0.0.19
     Locking 1 package to latest compatible version
    Updating kubit v0.0.18 (/home/influx/work/kubit) -> v0.0.19
  Downloaded tower-layer v0.3.3
...more cargo things