[Repo Assist] fix: replace removed np.float and np.int aliases with built-in equivalents

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Summary

Fixes two uses of NumPy type aliases (np.float and np.int) that were deprecated in NumPy 1.20 and removed in NumPy 1.24. Since this project requires numpy >2.0, both calls raise AttributeError at runtime.

Root Cause

np.float and np.int were convenience aliases for the built-in Python float and int. NumPy removed them entirely in 1.24 ([release notes]((numpy.org/redacted)

Changes

File	Line	Before	After
dowhy/gcm/independence_test/kernel_operation.py	52	.astype(np.float)	.astype(float)
dowhy/do_samplers/kernel_density_sampler.py	105	np.int(n.cumprod()[-1])	int(n.cumprod()[-1])

Trade-offs

None — float and int are the correct replacements and behave identically in these contexts.

Test Status

These functions (apply_delta_kernel and KernelSampler.sample_point) currently have no direct unit tests, so CI tests do not exercise the fixed lines. The fixes are mechanical one-line corrections verified by code inspection. No CI infrastructure failures were observed in test runs against unrelated code.

Note

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[emrekiciman]

lgtm