Missing changing class name from .custom-file-control to custom-file-label

[ysds]

The old .custom-file-control class have been rewrited to .custom-file-label in #25068.

Related diff: https://github.com/twbs/bootstrap/pull/25068/files#diff-e5540857a54676b43146ad92add2dbde

But .custom-file-control class is still exist in the current SCSS:

bootstrap/scss/_custom-forms.scss

Lines 250 to 257 in 470b447

	&:focus ~ .custom-file-control {
	border-color: $custom-file-focus-border-color;
	box-shadow: $custom-file-focus-box-shadow;
	&::before {
	border-color: $custom-file-focus-border-color;
	}
	}