sysutils/onefetch: update to 2.18.0

Features
- add new info line called "Churn" which displays the files with the most
  modifications (commits) (#1071) @o2sh @Byron
- add Hlsl support (#1082) @progDes007

Chore
- performance: optimize case where repo has a commit-graph for massive
  performance gains (#1081) @Byron
- docs: add a cmd.exe version of the cd snippet (#1048) @mataha
- refacto: use the builder pattern to instantiate the Info struct (#1047)
  @o2sh @spenserblack
- improve bot regex (#1086) @o2sh @spenserblack

(pin)