Vertical offset of progress bar label on IE11

[Trainmaster]

• Operating system and version: Windows 7
• Browser and version: Internet Explorer 11 (11.0.9600.19399)

In #22703 the line line-height: $progress-height; was removed. But it seems like it's not really unnecessary as the commit message says, at least not in IE11.

Just navigate to https://getbootstrap.com/docs/4.3/components/progress/#labels and change

<div class="bd-example">

to something like

<div class="bd-example" style="line-height: 30px;">