Lightning MacOS Py37

[ndem0]

Describe the bug
There is a bug on the Lightning using MacOS with Python3.7

To Reproduce
Run the pytest

Output

ImportError while importing test module '/Users/runner/work/PINA/PINA/tests/test_cartesian.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
../../../hostedtoolcache/Python/3.7.[17](https://github.com/mathLab/PINA/actions/runs/5322584162/jobs/9639232481?pr=118#step:5:18)/x64/lib/python3.7/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_cartesian.py:4: in <module>
    from pina import LabelTensor, Condition, CartesianDomain, PINN
pina/__init__.py:13: in <module>
    from .pinn import PINN
pina/pinn.py:10: in <module>
    from .solver import SolverInterface
pina/solver.py:5: in <module>
    import lightning.pytorch as pl
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/lightning/__init__.py:32: in <module>
    from lightning.app import storage  # noqa: E402
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/lightning/app/__init__.py:25: in <module>
    from lightning.app import components  # noqa: E402, F401
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/lightning/app/components/__init__.py:1: in <module>
    from lightning.app.components.database.client import DatabaseClient
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/lightning/app/components/database/__init__.py:2: in <module>
    from lightning.app.components.database.server import Database
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/lightning/app/components/database/server.py:29: in <module>
    from lightning.app.core.work import LightningWork
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/lightning/app/core/__init__.py:1: in <module>
    from lightning.app.core.app import LightningApp
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/lightning/app/core/app.py:40: in <module>
    from lightning.app.core.work import LightningWork
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/lightning/app/core/work.py:25: in <module>
    from lightning.app.storage import Path
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/lightning/app/storage/__init__.py:1: in <module>
    from lightning.app.storage.drive import Drive  # noqa: F401
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/lightning/app/storage/drive.py:23: in <module>
    from lightning.app.storage.path import _filesystem, _shared_storage_path, LocalFileSystem
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/lightning/app/storage/path.py:23: in <module>
    from fsspec import AbstractFileSystem
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/fsspec/__init__.py:12: in <module>
    from .compression import available_compressions
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/fsspec/compression.py:2: in <module>
    from bz2 import BZ2File
../../../hostedtoolcache/Python/3.7.17/x64/lib/python3.7/bz2.py:[19](https://github.com/mathLab/PINA/actions/runs/5322584162/jobs/9639232481?pr=118#step:5:20): in <module>
    from _bz2 import BZ2Compressor, BZ2Decompressor
E   ModuleNotFoundError: No module named '_bz2'

[dario-coscia]

@ndem0 it seams to be fixed by using pydantic==1.10.11 . Look at #152 tests as example