Fix FieldRenderer label_html function returning unsafe html

[lyndonscotthumphris]

unsafe html can still be returned from a label for checkboxes.

Issue

In renderers.py for the render method on `FieldRenderer:

django-bootstrap5/src/django_bootstrap5/renderers.py

Lines 484 to 487 in c064893

	if self.field_before_label():
	label = self.get_label_html()
	field = field + label
	label = EMPTY_SAFE_HTML

label is added to field on L486, which if label is not safe, escapes the checkbox field html.

Suggested Fix

The fix i propose is to return the EMPTY_SAFE_HTML if "skip" is chosen.
Otherwise let the render_label method handle it.

Side note: On current code self.show_label can be any value, i.e., "false", which if paired with an empty label "" would still invalidate the html (which is the case for our repo 😅 ).

[scuyangguang]

已收到，谢谢！