Update known releases

Author: davsclaus

catalog/camel-catalog/src/generated/resources/org/apache/camel/catalog/releases/camel-releases.json

@@ -1739,6 +1739,11 @@
         "date": "2026-04-25",
         "jdk": "17,21,25"
     },
+    {
+        "version": "4.21.0",
+        "date": "2026-07-01",
+        "jdk": "17,21,25"
+    },
     {
         "version": "4.3.0",
         "date": "2023-12-18",