style: Fix os-getcwd (PTH109) by replacing `os.getcwd()` calls with `Path.cwd()` #4413

…h.cwd() Ruff rule: https://docs.astral.sh/ruff/rules/os-getcwd/ When unable to confirm a Path would be accepted, I wrapped Path.cwd() with str(), so the variable would remain a string. When I had to add an import, I placed it such that it tends to what isort would do, but without changing other imports around it.