Pip-run

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65: Tests that require connectivity to the Internet now are skipped.

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Removed ``launch.with_path_overlay``, unused in this project.

Removed explicit parsing of ``.pth`` files, redundant to the
use of ``sitecustomize``.

Removed ``commands.parse_script_args`` (use ``separate`` instead).

Removed processing of ``JYTHONPATH`` as Jython is Python 2 only.

Removed ``commands.separate_dash``.

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Modernized path handling using pathlib (internal refactoring).

Renamed ``commands.parse_script_args`` to ``separate``, with an
alias for compatibility.

Restored coverage in tests.

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64: Switch to ``platformdirs`` for resolving the cache dir.

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52: ``pip-run`` now honors a ``PIP_RUN_MODE``.

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62: Fixed minimum dependency on ``more_itertools`` to match
usage.