fix: catch OverflowError in naturalsize() for very large integers

[koteshyelamati]

Problem

naturalsize() calls float(value) unconditionally, which raises OverflowError for very large integers:

>>> import humanize
>>> humanize.naturalsize(10**309)
OverflowError: int too large to convert to float

It also raises a raw ValueError from float() for non-numeric strings, with a confusing message.

Fix

Wrap float(value) in try/except (ValueError, OverflowError) and re-raise with a clear message indicating the argument type.

After fix

>>> humanize.naturalsize(10**309)
ValueError: naturalsize() argument must be a number, not 'int'
>>> humanize.naturalsize("abc")
ValueError: naturalsize() argument must be a number, not 'str'

[hugovk]

This doesn't add support, just re-raises an OverflowError as ValueError with an incorrect error:

>>> humanize.naturalsize(10**309)
ValueError: naturalsize() argument must be a number, not 'int'

An int is a number.

>>> humanize.naturalsize("abc")
ValueError: naturalsize() argument must be a number, not 'str'

Numeric strings are documented as an acceptable input.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.35%. Comparing base (2ad3641) to head (5325357).

Files with missing lines	Patch %	Lines
src/humanize/filesize.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #355      +/-   ##
==========================================
- Coverage   99.56%   99.35%   -0.22%     
==========================================
  Files          12       12              
  Lines         927      930       +3     
==========================================
+ Hits          923      924       +1     
- Misses          4        6       +2     

Flag	Coverage Δ
macos-latest	97.41% <50.00%> (-0.21%)	⬇️
ubuntu-latest	97.41% <50.00%> (-0.21%)	⬇️
windows-latest	95.26% <50.00%> (-0.21%)	⬇️

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