srsly: TypeError: 'escape_forward_slashes' is an invalid keyword argument for this function, when loading SpaCy 3.5 model (Python 3.8)

Since https://github.com/explosion/srsly/issues/83 is closed, I’m opening it again.

• I’m using Spacy 3.5.1 on Python 3.8.15 and experiencing the same issue. srsly version is 2.4.6.
• OS is Debian 10 Buster. My system had ujson installed, I tried uninstalling it but it didn’t solve the issue.
• Spacy 3.3.1, srrsly=2.4.3 in the same environment also gives the same error.

The code to reproduce:

bash:
python3 -m spacy download it_core_news_sm

python3:
import spacy

spacy.load("it_core_news_sm")

The full trace

nlp = spacy.load(model_name, exclude=excluded_pipes)
  File "/opt/conda/default/lib/python3.8/site-packages/spacy/__init__.py", line 54, in load
    return util.load_model(
  File "/opt/conda/default/lib/python3.8/site-packages/spacy/util.py", line 442, in load_model
    return load_model_from_package(name, **kwargs)  # type: ignore[arg-type]
  File "/opt/conda/default/lib/python3.8/site-packages/spacy/util.py", line 478, in load_model_from_package
    return cls.load(vocab=vocab, disable=disable, enable=enable, exclude=exclude, config=config)  # type: ignore[attr-defined]
  File "/opt/conda/default/lib/python3.8/site-packages/it_core_news_sm/__init__.py", line 10, in load
    return load_model_from_init_py(__file__, **overrides)
  File "/opt/conda/default/lib/python3.8/site-packages/spacy/util.py", line 659, in load_model_from_init_py
    return load_model_from_path(
  File "/opt/conda/default/lib/python3.8/site-packages/spacy/util.py", line 516, in load_model_from_path
    nlp = load_model_from_config(
  File "/opt/conda/default/lib/python3.8/site-packages/spacy/util.py", line 564, in load_model_from_config
    nlp = lang_cls.from_config(
  File "/opt/conda/default/lib/python3.8/site-packages/spacy/language.py", line 1781, in from_config
    interpolated = filled.interpolate() if not filled.is_interpolated else filled
  File "/opt/conda/default/lib/python3.8/site-packages/confection/__init__.py", line 196, in interpolate
    return Config().from_str(self.to_str())
  File "/opt/conda/default/lib/python3.8/site-packages/confection/__init__.py", line 419, in to_str
    flattened.set(section_name, key, try_dump_json(value, node))
  File "/opt/conda/default/lib/python3.8/site-packages/confection/__init__.py", line 503, in try_dump_json
    raise ConfigValidationError(config=data, desc=err_msg) from e
confection.ConfigValidationError: 

Config validation error
Couldn't serialize config value of type <class 'NoneType'>: 'escape_forward_slashes' is an invalid keyword argument for this function. Make sure all values in your config are JSON-serializable. If you want to include Python objects, use a registered function that returns the object instead.