Fix json_params_matcher raising TypeError on nested vs scalar mismatch (#814)

[philsong4-ai]

Summary

Fixes #814. json_params_matcher with strict_match=False raised TypeError: argument of type 'int' is not iterable (instead of reporting a normal mismatch) when the expected params had a scalar at a key but the actual JSON body had a nested object at the same key (and vice versa).

Root cause

responses/matchers.py::_filter_dict_recursively recursed whenever the value in the first dict was a mapping, without checking that the corresponding value in the second dict was also a mapping. The recursive call then did key in <scalar>, which raised.

Fix

Recurse only when both values are mappings:

if isinstance(val, dict) and isinstance(dict2[k], dict):
    val = _filter_dict_recursively(val, dict2[k])

A type mismatch at a key is now reported as a normal non-match (False, reason) instead of crashing.

Test

• Added test_json_params_matcher_not_strict_scalar_vs_nested_does_not_raise in responses/tests/test_matchers.py, asserting the matcher returns (False, ...) (not raises) in both the scalar-vs-nested and nested-vs-scalar directions.
• Full suite: 230 passed; flake8/black/isort clean.

[markstory]

Could you update the CHANGES file as well? You'll need to add a new section for 0.26.4

[markstory]

Duplicate of #815