Update count of compatible clients

The number of compatible clients has 90+.

Author: koic

docs/about/index.mdx

@@ -62,7 +62,7 @@ mode: "custom"
         <div className="stat-label">Official SDKs</div>
       </a>
       <a href="/clients" target="_blank" className="stat-card">
-        <div className="stat-number">80+</div>
+        <div className="stat-number">90+</div>
         <div className="stat-label">Compatible Clients</div>
       </a>
       <a