Modernize npsupport by removing the patch for the np._typecodes.

[junkmd]

Fixes #858

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.74%. Comparing base (6a580b3) to head (514f052).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #857      +/-   ##
==========================================
- Coverage   84.75%   84.74%   -0.01%     
==========================================
  Files         125      125              
  Lines       11571    11566       -5     
==========================================
- Hits         9807     9802       -5     
  Misses       1764     1764              

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[junkmd]

This PR focuses solely on removing the patch for the _typecodes mapping that existed in older NumPy versions, as discussed in #216 (comment).

To verify that the mapping elements remain unchanged, simply run the following in interactive mode both before and after code modifications.

>>> import comtypes
>>> comtypes.npsupport.enable()
>>> for k, v in comtypes.npsupport.typecodes.items():
...     k, v
... 
('|i1', <class 'ctypes.c_byte'>)
('|u1', <class 'ctypes.c_ubyte'>)
('<f4', <class 'ctypes.c_float'>)
('<i2', <class 'ctypes.c_short'>)
('<u2', <class 'ctypes.c_ushort'>)
('<f8', <class 'ctypes.c_double'>)
('<i4', <class 'ctypes.c_long'>)
('<u4', <class 'ctypes.c_ulong'>)
('|b1', <class 'ctypes.c_bool'>)
('<i8', <class 'ctypes.c_longlong'>)
('<u8', <class 'ctypes.c_ulonglong'>)

[junkmd]

Codecov observed only a -0.01% decrease in coverage with this change.
This is likely just because we're not covering branches where npsupport isn't enabled.

514f052
https://app.codecov.io/gh/enthought/comtypes/commit/514f052094a08b51599bde9158ac21063c6c4c91