fix: catch OverflowError in _parse_int float fallback

[Copilot]

_parse_int falls back to int(float(val)) for float-string inputs, but only caught ValueError. Inputs like "inf" or "1e309" produce float("1e309") → inf, and int(inf) raises OverflowError, bubbling up to get_int() callers instead of returning the default.

Changes

• benedict/dicts/parse/parse_util.py: extend inner except to (ValueError, OverflowError) so overflow inputs return None cleanly

def _parse_int(val: str) -> int | None:
    try:
        return int(val)
    except ValueError:
        try:
            return int(float(val))
        except (ValueError, OverflowError):  # was: except ValueError
            return None

• tests/dicts/parse/test_parse_dict.py: add "inf" and "1e309" cases to test_get_int, asserting both return the caller-supplied default

Checklist before requesting a review

• I have performed a self-review of my code.
• I have added tests for the proposed changes.
• I have run the tests and there are not errors.