Update Sponsors (#2599)

Co-authored-by: fb55 <[email protected]>

Author: github-actions[bot]

Readme.md

@@ -282,8 +282,8 @@ Does your company use Cheerio in production? Please consider [sponsoring this pr
 
 <!-- BEGIN SPONSORS: sponsor -->
 
-<a href="https://substack.com/" target="_blank" rel="noopener noreferrer">
-            <img style="max-height:128px;max-width:128px" src="https://avatars.githubusercontent.com/u/53023767?v=4&s=128" title="Substack" alt="Substack"></img>
+<a href="https://github.com/about" target="_blank" rel="noopener noreferrer">
+            <img style="max-height:128px;max-width:128px" src="https://avatars.githubusercontent.com/u/9919?v=4&s=128" title="GitHub" alt="GitHub"></img>
           </a>
 <a href="https://cryptocasinos.com/" target="_blank" rel="noopener noreferrer">
             <img style="max-height:128px;max-width:128px" src="https://images.opencollective.com/cryptocasinos/99b168e/logo.png" title="CryptoCasinos" alt="CryptoCasinos"></img>