formula: fix missing require

[branchvincent]

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Fixes https://github.com/Homebrew/homebrew-core/actions/runs/9948901739/job/27486941651?pr=177448#step:3:76

$ brew test hatch
==> Testing hatch
==> /opt/homebrew/Cellar/hatch/1.12.0/bin/hatch new homebrew
Error: hatch: failed
Warning: Removed Sorbet lines from backtrace!
An exception occurred within a child process:
  NameError: uninitialized constant Formula::StringInreplaceExtension

[timsutton]

Ran into this elsewhere too, thanks!