Rename pathlib hook parameters (#9363)

* Rename pytest_ignore_collect fspath parameter to collection_path

* Rename pytest_collect_file fspath parameter to file_path

* Rename pytest_pycollect_makemodule fspath parameter to module_path

* Rename pytest_report_header startpath parameter to start_path

* Rename pytest_report_collectionfinish startpath parameter to start_path

* Update docs with the renamed parameters

* Use pytest-flakes fork temporarily to prove it works

* Use pytest-flakes 4.0.5

testing/test_skipping.py

@@ -1317,7 +1317,7 @@ def test_xfail_item(pytester: Pytester) -> None:
             def runtest(self):
                 pytest.xfail("Expected Failure")
 
-        def pytest_collect_file(fspath, parent):
+        def pytest_collect_file(file_path, parent):
             return MyItem.from_parent(name="foo", parent=parent)
     """
     )
@@ -1391,7 +1391,7 @@ def test_mark_xfail_item(pytester: Pytester) -> None:
             def runtest(self):
                 assert False
 
-        def pytest_collect_file(fspath, parent):
+        def pytest_collect_file(file_path, parent):
             return MyItem.from_parent(name="foo", parent=parent)
     """
     )