chore: update readme (#1712)

Author: brendt

README.md

@@ -1,6 +1,6 @@
 <p align="center">
   <a href="https://tempestphp.com">
-    <img src="https://github.com/tempestphp/.github/raw/refs/heads/main/.github/tempest-logo.svg" width="100" />
+    <img src="https://github.com/tempestphp/.github/raw/refs/heads/main/logo_current/tempest-logo.png" width="100" />
   </a>
 </p>