dev-cmd/bump-formula-pr: fix type error

[kou]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
  • No. Should I add a new test for this? It seems that this was introduced by 587f4ba11bc7be30ece7a5ceae10e3395fdf131 but the commit didn't add any new tests.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

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The error message:

Error: Parameter 'formula': Expected type String, got type Formulary::FormulaNamespace87ec47e7f9dec2f39e30adcc9fdea28fb57606eab88d4f83e8ebec591964143c::ApacheArrow with value #<Formula apache-arrow (sta...ore/Formula/a/apache-arrow.rb>
Caller: /opt/homebrew/Library/Homebrew/dev-cmd/bump-formula-pr.rb:152
Definition: /opt/homebrew/Library/Homebrew/dev-cmd/bump-formula-pr.rb:417 (Homebrew::DevCmd::BumpFormulaPr#check_for_mirrors)
/opt/homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11618/lib/types/configuration.rb:296:in `call_validation_error_handler_default'
/opt/homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11618/lib/types/configuration.rb:303:in `call_validation_error_handler'
/opt/homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11618/lib/types/private/methods/call_validation.rb:310:in `report_error'
/opt/homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11618/lib/types/private/methods/call_validation.rb:218:in `block in validate_call'
/opt/homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11618/lib/types/private/methods/signature.rb:213:in `each_args_value_type'
/opt/homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11618/lib/types/private/methods/call_validation.rb:215:in `validate_call'
/opt/homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11618/lib/types/private/methods/_methods.rb:277:in `block in _on_method_added'
/opt/homebrew/Library/Homebrew/dev-cmd/bump-formula-pr.rb:152:in `run'
/opt/homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11618/lib/types/private/methods/call_validation.rb:270:in `bind_call'
/opt/homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11618/lib/types/private/methods/call_validation.rb:270:in `validate_call'
/opt/homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11618/lib/types/private/methods/_methods.rb:277:in `block in _on_method_added'
/opt/homebrew/Library/Homebrew/brew.rb:94:in `<main>'
Please report this issue:
  https://docs.brew.sh/Troubleshooting

This happened when I use the following command line:

brew bump-formula-pr \
     --commit \
     --no-audit \
     --sha256="abcf1934cd0cdddd33664e9f2d9a251d6c55239d1122ad0ed223b13a583c82a9" \
     --url="https://www.apache.org/dyn/closer.lua?path=arrow/arrow-18.0.0/apache-arrow-18.0.0.tar.gz" \
     --verbose \
     --write-only \
     apache-arrow

[carlocab]

Thanks!