replace `np.float` with `float` as it's deprecated since numpy 1.20.0

[hubutui]

lvis-api/lvis/eval.py

Lines 361 to 362 in da5f65d

	tp_sum = np.cumsum(tps, axis=1).astype(dtype=np.float)
	fp_sum = np.cumsum(fps, axis=1).astype(dtype=np.float)

As descriped at upstream:

np.float was a deprecated alias for the builtin float. To avoid this error in existing code, use float by itself.

[assafbot]

#38 proposed fix

[rbgirshick]

Resolved in main now.