Update KubeCon Europe event

Author: ScottBrenner

content/en/_index.html

@@ -43,7 +43,7 @@ <h2>The Challenges of Migrating 150+ Microservices to Kubernetes</h2>
         <button id="desktopShowVideoButton" onclick="kub.showVideo()">Watch Video</button>
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-        <a href="https://events.linuxfoundation.org/kubecon-cloudnativecon-europe-2022/?utm_source=kubernetes.io&utm_medium=nav&utm_campaign=kccnceu22" button id="desktopKCButton">Attend KubeCon Europe on May 17-20, 2022</a>
+        <a href="https://events.linuxfoundation.org/kubecon-cloudnativecon-europe-2023/?utm_source=kubernetes.io&utm_medium=nav&utm_campaign=kccnceu23" button id="desktopKCButton">Attend KubeCon Europe on April 17-21, 2023</a>
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