chore(pom): downgrade Java version from 23 to 21

Author: OtavioXimarelli

pom.xml

@@ -20,7 +20,7 @@
 
 
             <properties>
-                <java.version>23</java.version>
+                <java.version>21</java.version>
                 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
                 <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
                 <spring-ai.version>1.0.0-M6</spring-ai.version>