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gh-140009: Optimize dict object by replacing PyTuple_Pack with PyTuple_FromArray - #144529
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Fixes: #144529
Summary
This PR replaces PyTuple_Pack with PyTuple_FromArray in Objects/dictobject.c for creating small tuples (size 2).
PyTuple_FromArray is more efficient than PyTuple_Pack because it avoids the overhead of variadic arguments (va_args) processing by taking a pointer to a pre-allocated array of PyObject*.
Changes
Performance Impact
This is part of a general effort to optimize small tuple creation across the codebase. Replacing PyTuple_Pack with PyTuple_FromArray for small, fixed-size tuples reduces call overhead.