chore(login): update the login banners (#72984)

Updated login banners to promote the Codecov + Sentry and backend tech
trends workshop.

Author: pevensentry

src/sentry/templates/sentry/partial/alerts.html

@@ -78,9 +78,9 @@
   <div class="alert-banner">
     <div class="alert-message">
       {% if banner_choice == 0 %}
-      Join our workshop: Tracing Frontend Issues with Backend Solutions on June 20th. &nbsp<a target="_blank" href="https://sentry.io/resources/tracing-frontend-issues-with-backend-solutions/?utm_source=pendo&utm_medium=pendo&utm_campaign=tracing-fy25q2-traceworkshop&utm_content=workshop-tracingworkshop-rsvp">Register now.</a>
+      Join us June 25th to see a live demo on best practices for pre- and post-release using Sentry and Codecov. &nbsp<a target="_blank" href="https://sentry.io/resources/intro-to-sentry-and-codecov-live-demo/?utm_source=pendo&utm_medium=pendo&utm_campaign=general-fy25q2-sentrylivedemo&utm_content=workshop-live-demo-workshop-rsvp">Register now.</a>
       {% elif banner_choice == 1 %}
-      Join our workshop: Tracing Frontend Issues with Backend Solutions on June 20th. &nbsp<a target="_blank" href="https://sentry.io/resources/tracing-frontend-issues-with-backend-solutions/?utm_source=pendo&utm_medium=pendo&utm_campaign=tracing-fy25q2-traceworkshop&utm_content=workshop-tracingworkshop-rsvp">Register now.</a>
+      Join leaders at Laravel, Prisma, Supabase and Node as they discuss the future of backend development on July 16th. &nbsp<a target="_blank" href="https://sentry.io/resources/behind-the-code-a-discussion-with-backend-experts/?utm_source=pendo&utm_medium=pendo&utm_campaign=backend-fy25q2-backend&utm_content=workshop-behind-the-code-backend-pros-rsvp">Register now.</a>
       {% endif %}
     </div>
   </div>