Release 4.28.0 (#3046)

* Revert "[POST-RELEASE] - Clearing breaking change justifications"

This reverts commit 5fdaf9f.

* Release 4.28.0

Author: ozangunalp

.github/project.yml

@@ -1,5 +1,5 @@
 name: SmallRye Reactive Messaging
 release:
-    previous-version: 4.27.0
-    current-version: 4.28.0-RC1
+    previous-version: 4.28.0-RC1
+    current-version: 4.28.0
     next-version: 999-SNAPSHOT

smallrye-reactive-messaging-kafka-test-companion/revapi.json

@@ -24,7 +24,15 @@
     "criticality" : "highlight",
     "minSeverity" : "POTENTIALLY_BREAKING",
     "minCriticality" : "documented",
-    "differences" : [ ]
+    "differences" : [{
+        "code": "java.field.constantValueChanged",
+        "old": "field io.smallrye.reactive.messaging.kafka.companion.test.KafkaBrokerExtension.KAFKA_VERSION",
+        "new": "field io.smallrye.reactive.messaging.kafka.companion.test.KafkaBrokerExtension.KAFKA_VERSION",
+        "justification": "Update default kafka version from 3.3.2 to 4.0.0",
+        "oldValue": "3.3.2",
+        "newValue": "4.0.0"
+    }
+    ]
   }
 }, {
   "extension" : "revapi.reporter.json",
@@ -43,4 +51,4 @@
     "minCriticality" : "documented",
     "output" : "out"
   }
-} ]
+} ]