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Fix mypy issues
```
test/unit/tool_util/test_parsing.py:954: error: Argument 1 to "get_tool_source" has incompatible type "Traversable"; expected "str | PathLike[str] | None" [arg-type]
tool_source = get_tool_source(tool_path)
^~~~~~~~~
test/unit/tool_util/test_parsing.py:960: error: Argument 1 to "get_tool_source" has incompatible type "Traversable"; expected "str | PathLike[str] | None" [arg-type]
tool_source = get_tool_source(tool_path)
^~~~~~~~~
```