test_is_valid_should_not_mutate fails with Python 3.13

When packaging new version of this package for openSUSE/Factory, test test_is_valid_should_not_mutate fails:

```
[ 19s] =================================== FAILURES ===================================
[ 19s] __________ test_is_valid_should_not_mutate[_invalidator_1-jsonschema] __________
[ 19s]
[ 19s] cls =
[ 19s] func = . at 0x7fba491e0d60>
[ 19s] when = 'call'
[ 19s] reraise = (, )
[ 19s]
[ 19s] @classmethod
[ 19s] def from_call(
[ 19s] cls,
[ 19s] func: Callable[[], TResult],
[ 19s] when: Literal["collect", "setup", "call", "teardown"],
[ 19s] reraise: type[BaseException] | tuple[type[BaseException], ...] | None = None,
[ 19s] ) -> CallInfo[TResult]:
[ 19s] """Call func, wrapping the result in a CallInfo.
[ 19s]
[ 19s] :param func:
[ 19s] The function to call. Called without arguments.
[ 19s] :type func: Callable[[], _pytest.runner.TResult]
[ 19s] :param when:
[ 19s] The phase in which the function is called.
[ 19s] :param reraise:
[ 19s] Exception or exceptions that shall propagate if raised by the
[ 19s] function, instead of being wrapped in the CallInfo.
[ 19s] """
[ 19s] excinfo = None
[ 19s] start = timing.time()
[ 19s] precise_start = timing.perf_counter()
[ 19s] try:
[ 19s] > result: TResult | None = func()
[ 19s]
[ 19s] cls =
[ 19s] duration = 0.010382263993960805
[ 19s] excinfo = \n... ~~~~~~~~~~~~^^\nResourceWarning: unclosed database in \n') tblen=11>
[ 19s] func = . at 0x7fba491e0d60>
[ 19s] precise_start = 33629.259203216
[ 19s] precise_stop = 33629.26958548
[ 19s] reraise = (, )
[ 19s] result = None
[ 19s] start = 1732094445.8980231
[ 19s] stop = 1732094445.9084063
[ 19s] when = 'call'
[ 19s]
[ 19s] /usr/lib/python3.13/site-packages/_pytest/runner.py:341:
[ 19s] _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
[ 19s] /usr/lib/python3.13/site-packages/_pytest/runner.py:242: in
[ 19s] lambda: runtest_hook(item=item, **kwds), when=when, reraise=reraise
[ 19s] item =
[ 19s] kwds = {}
[ 19s] runtest_hook =
[ 19s] /usr/lib/python3.13/site-packages/pluggy/_hooks.py:513: in __call__
[ 19s] return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
[ 19s] firstresult = False
[ 19s] kwargs = {'item': }
[ 19s] self =
[ 19s] /usr/lib/python3.13/site-packages/pluggy/_manager.py:120: in _hookexec
[ 19s] return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
[ 19s] firstresult = False
[ 19s] hook_name = 'pytest_runtest_call'
[ 19s] kwargs = {'item': }
[ 19s] methods = [>]
[ 19s] self = <_pytest.config.PytestPluginManager object at 0x7fba4a7602f0>
[ 19s] /usr/lib/python3.13/site-packages/_pytest/threadexception.py:92: in pytest_runtest_call
[ 19s] yield from thread_exception_runtest_hook()
[ 19s] /usr/lib/python3.13/site-packages/_pytest/threadexception.py:68: in thread_exception_runtest_hook
[ 19s] yield
[ 19s] cm = <_pytest.threadexception.catch_threading_exception object at 0x7fba4923e990>
[ 19s] /usr/lib/python3.13/site-packages/_pytest/unraisableexception.py:95: in pytest_runtest_call
[ 19s] yield from unraisable_exception_runtest_hook()
[ 19s] _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
[ 19s]
[ 19s] def unraisable_exception_runtest_hook() -> Generator[None]:
[ 19s] with catch_unraisable_exception() as cm:
[ 19s] try:
[ 19s] yield
[ 19s] finally:
[ 19s] if cm.unraisable:
[ 19s] if cm.unraisable.err_msg is not None:
[ 19s] err_msg = cm.unraisable.err_msg
[ 19s] else:
[ 19s] err_msg = "Exception ignored in"
[ 19s] msg = f"{err_msg}: {cm.unraisable.object!r}\n\n"
[ 19s] msg += "".join(
[ 19s] traceback.format_exception(
[ 19s] cm.unraisable.exc_type,
[ 19s] cm.unraisable.exc_value,
[ 19s] )
[ 19s] )
[ 19s] > warnings.warn(pytest.PytestUnraisableExceptionWarning(msg))
[ 19s] E pytest.PytestUnraisableExceptionWarning: Exception ignored in:
[ 19s] E
[ 19s] E Traceback (most recent call last):
[ 19s] E File "/usr/lib/python3.13/site-packages/jsonschema/exceptions.py", line 168, in _set
[ 19s] E for k, v in kwargs.items():
[ 19s] E ~~~~~~~~~~~~^^
[ 19s] E ResourceWarning: unclosed database in
[ 19s]
[ 19s] cm = <_pytest.unraisableexception.catch_unraisable_exception object at 0x7fba4923e8d0>
[ 19s] err_msg = 'Exception ignored in'
[ 19s] msg = 'Exception ignored in: \n\nTraceback (most recent call last):\n File "/u...n ~~~~~~~~~~~~^^\nResourceWarning: unclosed database in \n'
[ 19s]
[ 19s] /usr/lib/python3.13/site-packages/_pytest/unraisableexception.py:85: PytestUnraisableExceptionWarning
[ 19s] =============================== warnings summary ===============================
[ 19s] ../../../../../usr/lib/python3.13/site-packages/jupyter_core/application.py:23
[ 19s] /usr/lib/python3.13/site-packages/jupyter_core/application.py:23: DeprecationWarning: Jupyter is migrating its paths to use standard platformdirs
[ 19s] given by the platformdirs library. To remove this warning and
[ 19s] see the appropriate new directories, set the environment variable
[ 19s] `JUPYTER_PLATFORM_DIRS=1` and then run `jupyter --paths`.
[ 19s] The use of platformdirs will be the default in `jupyter_core` v6
[ 19s] from .paths import (
[ 19s]
[ 19s] -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
[ 19s] ============================= slowest 10 durations =============================
[ 19s] 0.42s call tests/test_sign.py::TestNotary::test_sign_stdin
[ 19s] 0.04s call tests/test_validator.py::test_future[fastjsonschema]
[ 19s] 0.04s call tests/test_validator.py::test_nb2[jsonschema]
[ 19s] 0.03s call tests/test_sign.py::TestNotary::test_cull_db
[ 19s] 0.02s call tests/test_api.py::TestAPI::test_capture_validation_error
[ 19s] 0.02s call tests/test_api.py::TestAPI::test_read
[ 19s] 0.02s call tests/test_validator.py::test_future[jsonschema]
[ 19s] 0.02s call tests/test_validator.py::test_invalid_validator_raises_value_error_after_read
[ 19s] 0.02s call tests/test_validator.py::test_nb4jupyter_metadata_timings[fastjsonschema]
[ 19s] 0.02s call tests/test_validator.py::test_nb4custom[fastjsonschema]
[ 19s] =========================== short test summary info ============================
[ 19s] SKIPPED [2] tests/test_validator.py:57: Does not work in all architectures
[ 19s] FAILED tests/test_validator.py::test_is_valid_should_not_mutate[_invalidator_1-jsonschema]
[ 19s] ============= 1 failed, 185 passed, 2 skipped, 1 warning in 1.28s ==============
```

[Complete build log](https://github.com/user-attachments/files/17828254/_log.txt) with the list of all packages used and steps taken to reproduce the problem. Notice, that whole test suite passes with 3.10 and 3.12.