Accessibility issue with Carousel

[paulGeoghegan]

Describe the bug

A bug is a demonstrable problem caused by code in the library. Please provide a clear and concise description of what the bug is here.
When autoplay is set on a carousel component it is constantly announcing to screen reader users about the current tab being selected which is very annoying especially if you have multiple of them on one page.
Also, on the gallery example with the thumbnails it does not tell screen reader users which item is selected.
I do however love how accessible it is and it follows all of the guidance on making carousels accessible.

To Reproduce

Steps to reproduce the behavior:

1. Go to https://backers.webawesome.com/docs/components/carousel,
2. wait on the page while using a screen reader,
3. You will hear constant updates about the carousel with autoplay,
4. Navigate to the gallery example and try to select one of the thumbnails to change the current slide,
5. There is no indication of which one is currently selected.

Browser / OS

• OS: Windows
• Browser: Firefox
• Browser version: 127.0.2
• Screen Reader: NVDA