Fix kqueue CSPLAT_SQE Type

[ThadHouse]

Description

kevent.ident is a uintptr_t, not an int. C didn't really care, but if C++ included quic_platform.h, an error would occur as narrowing from signed to unsigned in a designated initializer is an error in C++. Could be solved either by adding an explicit cast, or changing the type to be correct. Changing the type seemed like the better option.

Testing

Existing tests will cover it.

Documentation

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.32%. Comparing base (22b7dda) to head (4a342e1).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4527      +/-   ##
==========================================
- Coverage   86.37%   86.32%   -0.05%     
==========================================
  Files          56       56              
  Lines       15515    15517       +2     
==========================================
- Hits        13401    13395       -6     
- Misses       2114     2122       +8     

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