Fix task-list checkbox styling (#10668)

* Fix task-list checkbox styling

The pandoc renderer will append the class "task-list" to the ul element
wrapping a li with one or more check-boxes. This allows us to select for
them, removing their list-style-type property. However, goldmark and the
gfm spec doesn't specify the "task-list" class name, so we can't use
that to fix the issue there.

Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>

* Update to goldmark v1.1.25

This version adds the missing space after a checkbox.

Resolves: #9656

Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>

Co-authored-by: zeripath <art27@cantab.net>

vendor/github.com/yuin/goldmark/extension/tasklist.go

@@ -92,9 +92,9 @@ func (r *TaskCheckBoxHTMLRenderer) renderTaskCheckBox(w util.BufWriter, source [
 		w.WriteString(`<input disabled="" type="checkbox"`)
 	}
 	if r.XHTML {
-		w.WriteString(" />")
+		w.WriteString(" /> ")
 	} else {
-		w.WriteString(">")
+		w.WriteString("> ")
 	}
 	return gast.WalkContinue, nil
 }