Update dpnp submodule call erf, synchronize dpnp array creation

[vchamarthi]

This pull request adds explicit synchronization steps after array computations in several benchmark implementations of dpnp to ensure that results are correctly written to memory. The main changes involve calling np.synchronize_array_data on output arrays at the end of each computation function.

Updated calls to the error function in black_scholes_dpnp.py to use np.scipy.special.erf for compatibility.

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