Update topbar to announce out-of-cycle release

Given the amount of time between releases, and the blast radius
of some of the regressions, provide more awareness around the
out-of-cycle release.

Author: jkatz

templates/pages/include/topbar.html

@@ -1,3 +1,3 @@
-February 12, 2026: <a href="/about/news/postgresql-182-178-1612-1516-and-1421-released-3235/">
-  PostgreSQL 18.2, 17.8, 16.12, 15.16, and 14.21 Released!
+February 16, 2026: <a href="/about/news/out-of-cycle-release-scheduled-for-february-26-2026-3241/">
+  Out-of-cycle release scheduled for February 26, 2026
 </a>