Return non-finite floats unchanged from naturaldelta

[uttam12331]

Summary

Closes #333.

naturaldelta()'s docstring says values it cannot convert to a timedelta are returned unchanged, and float("nan") already is. But float("inf") / float("-inf") raised an uncaught OverflowError (from int(value)) instead of being returned unchanged like nan:

>>> humanize.naturaldelta(float("nan"))
'nan'
>>> humanize.naturaldelta(float("inf"))
OverflowError: cannot convert float infinity to integer   # before
'inf'                                                      # after

Fix

Catch OverflowError and return the value unchanged only when it is non-finite. A too-large finite value — whose OverflowError comes from timedelta(seconds=...) — is still re-raised, preserving the documented Raises: OverflowError contract:

except OverflowError:
    if not math.isfinite(value):
        return str(value)
    raise

Tests

• test_naturaldelta_non_finite — asserts nan/inf/-inf return "nan"/"inf"/"-inf".
• test_naturaldelta_too_large_value_raises — locks in that a too-large finite value (1e30) still raises OverflowError.

Verified locally: pytest tests/test_time.py → 385 passed; ruff check clean.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.56%. Comparing base (08cf2c3) to head (18415fa).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #334   +/-   ##
=======================================
  Coverage   99.56%   99.56%           
=======================================
  Files          12       12           
  Lines         916      927   +11     
=======================================
+ Hits          912      923   +11     
  Misses          4        4           

Flag	Coverage Δ
macos-latest	97.62% <100.00%> (+0.02%)	⬆️
ubuntu-latest	97.62% <100.00%> (+0.02%)	⬆️
windows-latest	95.46% <100.00%> (+0.05%)	⬆️

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[codspeed-hq]

Merging this PR will not alter performance

✅ 15 untouched benchmarks

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_{Comparing uttam12331:fix/333-naturaldelta-inf (18415fa) with main (08cf2c3)}

[hugovk]

Thanks, just a couple of suggestions.