avoid creating `PyRef` inside `traverse` handler #11018

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4 errors and 2 warnings

ENOENT: no such file or directory, opendir 'D:\a\pyo3\pyo3\target\tests\target'

Error: ENOENT: no such file or directory, opendir 'D:\a\pyo3\pyo3\target\tests\target'

ENOENT: no such file or directory, opendir 'D:\a\pyo3\pyo3\target\tests\target'

Error: ENOENT: no such file or directory, opendir 'D:\a\pyo3\pyo3\target\tests\target'

'ref' input parameter is ignored when 'base' is set to HEAD

'base' input parameter is ignored when action is triggered by pull request event