fix(setup): correct has_ext_modules method parameter name

[hobostay]

Summary

Fix the method parameter name from to in class.

Root Cause

In line 33:

The parameter should be to follow Python method conventions. This is inconsistent with defined just above it on line 29, and with the parent class .

While functionally equivalent (Python doesn't enforce parameter naming), this:

• Confuses linters and type checkers (pylint R0201, mypy)
• Is inconsistent with the rest of the codebase
• Makes the code harder to read

Test plan

• Verify still works
• Verify wheel build process is unaffected

[Trinkle23897]

Thanks!