Strip punctuation from attribution

[ianthetechie]

Punctuation like commas, semicolons, etc. are fairly common ways of formatting attribution on the web. However, this looks

Example attribution string:

<a href=\"https://stadiamaps.com/\" target=\"_blank\">&copy; Stadia Maps</a> &amp; <a href=\"https://stamen.com\" target=\"_blank\">&copy; Stamen Design</a>; <a href=\"https://openmaptiles.org/\" target=\"_blank\">&copy; OpenMapTiles</a>; <a href=\"https://www.openstreetmap.org/copyright\" target=\"_blank\">&copy; OpenStreetMap</a>.

Here's a pathological example of a rendering fail in MapLibre Native on iOS. I expect we'll need to do a similar fix on Android too.

Thanks to @Archdoog for pointing this out!

[github-actions]

Bloaty Results (iOS) 🐋

Compared to main

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +200  [ = ]       0    TOTAL

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/bloaty-results-ios/pr-3287-compared-to-main.txt