chore: update appium banner link [deploy site]

Author: harsha509

website_and_docs/layouts/partials/announcement-banner.html

@@ -7,7 +7,7 @@
       <div class="alert alert-{{ $color }} col-12 fade show mb-0 p-0 -bg-{{ $color }}" role="alert">
         <h4 class="alert-heading text-center m-0">
           Appium Conf 2024 Call for Proposals is now open! Submissions close 28 July.
-          <a href="https://appiumconf.com/" target='_blank' aria-pressed="true">Learn more & submit</a></h4>
+          <a href="https://appiumconf.com/call-for-proposals/?utm_medium=Referral&utm_source=selenium.dev&utm_campaign=cfp" target='_blank' aria-pressed="true">Learn more & submit</a></h4>
       </div>
     </div>
   </div>