Run GA unittest workflow against python 3.13 too

[soxofaan]

related to dropping support for python 3.7 (#578): start running unit tests against py 3.13 too in github actions

python 3.13 was released 2024-10-07

[soxofaan]

Failing tests with python 3.13:

tests/extra/spectral_indices/test_spectral_indices.py FFFFFFFFFFFFFFFFFF [  3%]
FFFFFFFFFFFFFFFFF                                                        [  3%]

fails on this part:

>           with importlib_resources.files("openeo.extra.spectral_indices") / path as resource_path:
E           TypeError: 'PosixPath' object does not support the context manager protocol

[soxofaan]

One remaining failure:

tests/internal/test_warnings.py ...F...                                  [ 12%]


=================================== FAILURES ===================================
________________________ test_legacy_alias_classmethod _________________________

recwarn = WarningsRecorder(record=True)

    def test_legacy_alias_classmethod(recwarn):
        class Foo:
            @classmethod
            def add(cls, x, y):
                """Add x and y."""
                assert cls is Foo
                return x + y
    
            do_plus = legacy_alias(add, "do_plus", since="v1.2")
    
        assert Foo.add.__doc__ == "Add x and y."
        assert Foo.do_plus.__doc__ == (
            "\n"
            ".. deprecated:: v1.2\n"
            "   Usage of this legacy class method is deprecated. Use\n"
            "   :py:meth:`.add` instead.\n"
        )
    
        assert Foo().add(2, 3) == 5
        assert len(recwarn) == 0
    
        expected_warning = re.escape(
            # Workaround for bug in classmethod detection before Python 3.9 (see https://wrapt.readthedocs.io/en/latest/decorators.html#decorating-class-methods
            f"Call to deprecated {'class method' if sys.version_info >= (3, 9) else 'function (or staticmethod)'} do_plus."
            " (Usage of this legacy class method is deprecated. Use `.add` instead.)"
            " -- Deprecated since version v1.2."
        )
    
>       with pytest.warns(UserDeprecationWarning, match=expected_warning):
E       Failed: DID NOT WARN. No warnings of type (<class 'openeo.internal.warnings.UserDeprecationWarning'>,) matching the regex were emitted.
E        Regex: Call\ to\ deprecated\ class\ method\ do_plus\.\ \(Usage\ of\ this\ legacy\ class\ method\ is\ deprecated\.\ Use\ `\.add`\ instead\.\)\ \-\-\ Deprecated\ since\ version\ v1\.2\.
E        Emitted warnings: [ UserDeprecationWarning('Call to deprecated function (or staticmethod) do_plus. (Usage of this legacy class method is deprecated. Use `.add` instead.) -- Deprecated since version v1.2.')].

tests/internal/test_warnings.py:111: Failed

[soxofaan]

Already did some digging in that failing warnings test and there seems to be something in legacy_alias that doesn't work anymore under python 3.13. Detection of being a classmethod stopped working.

Maybe something related to https://docs.python.org/3/whatsnew/3.13.html#builtins:

Remove support for chained classmethod descriptors (introduced in gh-63272). These can no longer be used to wrap other descriptors, such as property. The core design of this feature was flawed and led to several problems. To “pass-through” a classmethod, consider using the wrapped attribute that was added in Python 3.10. (Contributed by Raymond Hettinger in gh-89519.)