chore: redo typo PR by cypherpepe (#9687)

Thanks cypherpepe for
AztecProtocol/aztec-packages#9683. Our policy is
to redo typo changes to dissuade metric farming. This is an automated
script.

---------

Co-authored-by: Cypher Pepe <125112044+cypherpepe@users.noreply.github.com>

README.md

@@ -1,5 +1,5 @@
 <div align="center">
-  <img height="210x" src="./assets/Aztec_banner.png" />
+  <img height="210" src="./assets/Aztec_banner.png" />
 
   <h1>Aztec.nr</h1>