Bump to 2.4.0 (#550)

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Co-authored-by: slinkydeveloper <slinkydeveloper@users.noreply.github.com>

Author: github-actions[bot]

gradle/libs.versions.toml

@@ -227,7 +227,7 @@
   log4j = '2.24.3'
   opentelemetry = '1.47.0'
   protobuf = '4.29.3'
-  restate = '2.4.0-SNAPSHOT'
+  restate = '2.4.0'
   schema-kenerator = '2.1.2'
   spring-boot = '3.4.9'
   vertx = '4.5.18'