docs: Update the docs banner for managed dbs (#2775)

Author: kyleconroy

docs/_templates/breadcrumbs.html

@@ -3,7 +3,7 @@
 {% block breadcrumbs %}
 {% if show_banner %}
 <header id="banner">
-  <div>✨ We're now working full-time on sqlc. Read more <a href="https://sqlc.dev/posts/2023/07/06/working-on-sqlc-full-time">here</a>.</div>
+  <div>You bring the SQL, we'll bring the db: Introducing <a href="https://sqlc.dev/posts/2023/09/25/v1.22.0-managed-databases">managed databases</a>.</div>
 </header>
 {% endif %}
 {{ super() }}