random_triangular: sqrt() is more accurate than **0.5 (#3317)

random_triangular: sqrt() is more accurate than **0.5 (#3317) · python/cpython@f5ea83f

Original file line number	Diff line number	Diff line change
`@@ -388,7 +388,7 @@ def triangular(self, low=0.0, high=1.0, mode=None):`
`388`	`388`	`u = 1.0 - u`
`389`	`389`	`c = 1.0 - c`
`390`	`390`	`low, high = high, low`
`391`		`-return low + (high - low) * (u * c) ** 0.5`
	`391`	`+return low + (high - low) * _sqrt(u * c)`
`392`	`392`
`393`	`393`	`## -------------------- normal distribution --------------------`
`394`	`394`