cask/artifact/relocated: widen type

[jonchang]

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Fixes the bug:

% brew readall --eval-all homebrew/cask
Error: Invalid cask: /opt/homebrew/Library/Taps/homebrew/homebrew-cask/Casks/touchosc-editor.rb
Cask 'touchosc-editor' definition is invalid: invalid 'artifact' stanza: Parameter 'target': Expected type String, got type Pathname with value #<Pathname:/Users/jonchang/...upport/TouchOSCEditor/layouts>
Caller: /opt/homebrew/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/sorbet-runtime-0.5.10175/lib/types/private/methods/call_validation.rb:117
Definition: /opt/homebrew/Library/Homebrew/cask/artifact/relocated.rb:48
Error: Invalid cask: /opt/homebrew/Library/Taps/homebrew/homebrew-cask/Casks/ilya-birman-typography-layout.rb
Cask 'ilya-birman-typography-layout' definition is invalid: invalid 'artifact' stanza: Parameter 'target': Expected type String, got type Pathname with value #<Pathname:/Users/jonchang/...rman Typography Layout.bundle>
Caller: /opt/homebrew/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/sorbet-runtime-0.5.10175/lib/types/private/methods/call_validation.rb:117
Definition: /opt/homebrew/Library/Homebrew/cask/artifact/relocated.rb:48

[BrewTestBot]

Review period will end on 2022-09-13 at 00:00:00 UTC.

[BrewTestBot]

Review period skipped due to critical label.