fix: tame search

[baszalmstra]

Fixes #1827

I made the search less wild by increasing the required similarity score.

> pixi search gcc* -p osx-arm64
Using channels: conda-forge
  x Could not find gcc

> pixi.exe search rttler* -p osx-arm64
Using channels: conda-forge
Package                                  Version             Channel            
py-rattler                               0.6.3               conda-forge/osx-arm64
py_rattler                               0.6.3               conda-forge/noarch