fix(deps): update dependency org.restheart:restheart to v8.9.0 (#8773)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

java/restheart/pom.xml

@@ -8,7 +8,7 @@
 
   <properties>
     <maven.compiler.release>25</maven.compiler.release>
-    <restheart.version>8.8.1</restheart.version>
+    <restheart.version>8.9.0</restheart.version>
   </properties>
 
   <dependencies>