chore(influxdb): update notice for tag switch-over (#2648)

influxdb/content.md

@@ -1,6 +1,6 @@
 # Notice
 
-On February 3, 2026, the latest tag for InfluxDB will point to InfluxDB 3 Core. To avoid unexpected upgrades, use specific version tags in your deployments.
+On April 7, 2026, the latest tag for InfluxDB will point to InfluxDB 3 Core. To avoid unexpected upgrades, use specific version tags in your deployments.
 
 # What is InfluxDB?