chore(version): bump to 5.5.0 (#132)

The mapTimeout field + builder method + DEFAULT_MAP_TIMEOUT constant
added on AxonFlowConfig is an additive public-API change. Semver calls
that MINOR, not PATCH — matching how the TS (5.4.0), Python (6.4.0),
and Go (5.4.0) SDKs shipped the same feature.

No code change; CHANGELOG section header retitled 5.4.1 -> 5.5.0 and
pom.xml version bumped.

Author: saurabhjain1592

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to the AxonFlow Java SDK will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [5.4.1] - 2026-04-20
+## [5.5.0] - 2026-04-20
 
 ### Added
 

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.getaxonflow</groupId>
     <artifactId>axonflow-sdk</artifactId>
-    <version>5.4.1</version>
+    <version>5.5.0</version>
     <packaging>jar</packaging>
 
     <name>AxonFlow Java SDK</name>