docs: upgrade guide: correct badge url

Author: aymanbagabas

UPGRADE_GUIDE_V2.md

@@ -568,6 +568,6 @@ Have thoughts on the v2 upgrade? We'd _love_ to hear about it. Let us know on…
 
 Part of [Charm](https://charm.land).
 
-<a href="https://charm.land/"><img alt="The Charm logo" src="https://stuff.charm.land/charm-badge.jpg" width="400"></a>
+<a href="https://charm.land/"><img alt="The Charm logo" src="https://stuff.charm.sh/charm-badge.jpg" width="400"></a>
 
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